SU56098A1 - Method of tanning leather - Google Patents

Description

Tanning of leather with a mixture of vegetable, for example, oak and sulphite cellulose extracts is already known. Oak extract was also proposed to be used together with synthetic tanning agent.

The proposed method of tanning leathers, especially when making rant, AGO soles and insoles, is characterized by the use of sulfitecellulose and plant extracts of coBMteteo with synthetic tanning agents. Usually, when cooking vegetable tanning extracts, sulfite and bisulfite are added to reduce the amount of insoluble parts. According to the proposed method, the introduction of these additives is excluded, since the unwelding of all three tanning agents is carried out jointly; and since sulfitecellulose syntan and extract have peptizing properties, the boiled mixture is obtained without sediment. The proposed method makes it possible to use non-vegetable tankids for tanning both with drum and tan juice tanning on a chromium-headed fire, thereby reducing the consumption of vegetable tannins, and the tanning process is accelerated and a uniform production is obtained throughout the skin.

Primer p. Tanning bottom semi-finished product. After the master-ash operations carried out according to the methods commonly used at the leather factories, the non-ash pans are fed to pickling.

Pickling is performed in a suspension drum on a solution of 2.75-SVo hydrochloric acid and 10.00 / 0 table salt from the weight of a cant; liquid coefficient 1.5 / o, temperature 16.18. Duration vrash, eni in the drum - 8 hours. Laying down in the drum - 12 hours. Additional rotation - 2 hours. Laying down on the goats of the piqued-up goat - 24 hours, the Pt-goat after-nickel is close to 5.

After that, the pelt is fed to chrome plating, which is carried out in the drum at a flow rate of 0, chromium oxide and salt; liquid coefficient is 1-2, and basicity is 47-48Vo according to Sharlemer.

The duration of rotation in the drum is 8 hours.

The pH of the chromed geol is close to 5.

Increased basicity in the chrome plating process, as well as neutralization

Chrome-plated pitcher is not produced.

Tanning is produced by a mixture of extracts of vegetable and sulphite-cellulose and synthetic tanning, boiled together without the addition of sulphite and bisulphite. The ratios of these tanning agents can be produced in very different combinations.

The preparation of the tanning mixture is carried out as follows. In the conventional stirred tank the extracts and the synthetic tanning agent are charged simultaneously. Water is given 1 l per 1 kg of solid tanning agents. Blend of the submersible in the longboat I phase in the drum The boiled mixture enters only phase III. The dosage of T is based on the weight of the mole. When making up the juice of a pH value, 2 is established by adding soda. To the juice is added P / o from the mol of sulphonated bursts. After: the emergence of skinned skin from phase III, the juice is considered to be phase II, to which the skin that has passed the first phase passes. After 24 hours of rotation, the spent juice is considered Phase I, and so on.

heated by coil to 90-95. The cooking time, with constant stirring, is 12 hours, after which ripening is given in a quiescent state for 24 hours.

One of the successful combinations is a mixture consisting of vegetable tannids, 25 / o - tannidosulfite cellulose extract and 1 synthetic tanning agent, say, Ayush, and the finished skin has all the necessary indicators of ordinary skin tanned on plant tannins.

The phase tanning mode is as follows: 24-3 or a 24-hour 4-hour drum, well. k. ZD t-ra 25 ° 4 hours., well. K. 3.3, t-ra 30 ° 6 h., g. to. 2.5, t-ra 40 °. It is allowed for 1 day. Further operations are carried out as usual. The subject matter of the invention. The method of tanning leather, for example, plantar, using plant and sulfite cellulose extracts, characterized in that synthetic tanning agent, for example, anthracene H, is added to this mixture of extracts and they are co-boiled.