SU48994A1 - The way of tanning - Google Patents

Description

Tanning the iron with solutions of ferric salts in the presence of acetic acid sodium is not new.

The proposed tanning method is characterized in that, in addition to the above ingredients, free acetic acid and table salt are also introduced into the tanning solution, which gives the skin a better quality than conventional iron tanning, x

The process of tanning according to the proposed method consists mainly in the fact that after the pickle and softening or after pickle, the hide is loaded into the drum with the above tanning solution and processed in it until uniform penetration through; During this period, the skin is discharged from the drum for a period of 24 hours, then neutralized with sodium hyposulfite (it can also be neutralized with ammonia or brown) and washed.

The washed skin is then trimmed in the usual way.

Golee, carved out by the above, can also be added with known mineral or artificial tannins, including sulphite cellulose extract. Used tanning solutions are used, after proper reinforcement, for

tanning of the following batches of ashes As the iron salt, it is possible to use both ferric chloride and ammonium iron alum; with this, salt gives best results. Details of the proposed method can be seen from the following description of an example of tanning pork skin and sacking.

Example. Preparation of working solutions. 1) 3.4 kg of iron-ammonium alum is dissolved in 8.8 l of water; the density of the solution is 2G We; 2) 2.48 kg of crystalline acetic acid sodium solute dissolved in 5.8 l of water — solution density 17 ° Vyo; 3) 925 g of sodium chloride dissolved in 3.5 liter water-density of solution 16 ° Vyo.

Tanning. Tanning juice No. 1 is prepared from 8.8 l of ammonium iron-alum, pl. 21 ° Beu., 5 liters of acetic acid sodium, pl. 17 ° Be, 200 g of technical acetic acid, specific gravity 1,058.

A total of 14 liters of juice No. 1 with a density of 18 ° Veu.

Acetic acid was first added to the alum solution, and then acetic acid sodium was added. .

Pickled and prepared for tanning by the method of lame production, a 16 kg weight of the pendant is loaded into the drum on the working solution from the tannic:. V ..- ..,. ..

:( ":.,„ ..,

, -. , -..-

. . . : --- - -, -

 .., .., -, .- ....:.:; - i HOfo of juice J 1-5.25 l, solution of salt salt with a density of 16 ° Be-2.3 l and water-6.5 l.

The density of the working solution 9 ,, liquid coefficient at the beginning of 1: 1.2, and by the end of tanning -1: 2. t-22 °.

To the remaining tanning juice No. 1 in the amount of 8.75 l, 800 cm of a solution of acetic acid soda with a density of 17 ° Veu and 12CO cm of a solution of sodium chloride with a density of 16 ° Veu were added; thus, tanning juice No. 2 was obtained. After 30 min. drum rotation, the working juice density decreased to 8.5 ° Vy, the color is yellow-orange. Then 3 tg of tanning juice No. 2 was added, then after 1 hour another 3 liters of this juice was added, after which the working juice density was restored to 9.8 ° Veu (the color is red-orange, the color is 50%) and, finally, after 90 minutes . another 4.75 liters of tanning juice No. 2 was added; in 3 hours of rotation of the drum from the onset of tanning, a complete procage of an orange-red (along the yellow-red cut) color was obtained.

The rotation of the drum was continued even before a noticeable coagulation of the working solution, after which the skin was unloaded onto the goats for flow.

The total duration of tanning is 5.5 hours.

After two hours of wrapping, the skin is left on the basement at a temperature of 20-25 °, up to a moisture content of 30-35%, and then loaded into the drum for neutralization with hyposulfite in an amount of 1.5% by weight of a 100% heat-sink duration 30 min. Then hyposulfite is drained and washed with water; 250% by weight of the mole-temperature 35 °, duration 20 min. After washing, part of the leather was pressed and hand-burned from the bakhtarma with a mixture of 65 parts of seal and 35 parts of technical fat, and the other part was painted black for chrome black — 1% by weight of water, 80%, t-ra 40 ° After dyeing, the same amount of fat was applied as the first part of the skin. Further finishing is usually taken for the bridges and the black leather. In particular, the material was

under the flax, then followed by gouging on the machine, secondary filling, lay for 8 hours, plastering and hanging on at a temperature of 27-30 °, then dripping, drawing on the machine and the frame on the frames.

Two halves of pigskin, selected after the basement and neutralization, were loaded into a 10% Amsok sulphite-cellulose extract solution in an amount of 4 liters; after a 2-hour rotation of the drum, the working solution was supported by adding 1 liter of a 30% extract solution, and an hour later another 1.5 liters of a 30% extract solution was added. The processing time until a uniform penetration through -4 hours, after which the skin was unloaded and further processing was carried out according to the usual method of a red-bodied stylechny semi-shaft.

The quality of the finished product (yufti, pavement and semi-shaft) in appearance and feels quite satisfactory and is not inferior to the corresponding product of the same size. Skin analysis revealed the following:

1) the content of iron oxide in the average of 3.8% (in terms of 18% moisture);

2) welding temperature 70 °;

3) resistance to rupture of the top product on average 3.4 kg;

4) elongation of 48%;

For the preparation of tanning juices number 1 and 2 consumed;

1) ammonium iron alum 3.4 kg - 21.2% by weight of the mole; . ,

2) acetic acid sodium 2.48 kg - 15.5% by weight of the mole;

3) salt 925 g-5.78% by weight of the mole;

4) acetic acid 200 g-1.28% by weight of the mole.

After tanning, 15 liters of waste juice with a density of 10.5 ° B6 are collected, with a content of 10.4 g / l of iron oxide, which can be fully used for the next tanning.

Consequently, the actual consumption of materials per 16 "g a gol:

Claims (4)

1) iron oxide 2.5% by weight mole; 2) acetic acid sodium 7.7% by weight of the mole;. 3) acetic acid 0, by weight a mole; 4) Iovarennaya salt 2.89% by weight of the mole, the subject invention. 1. A method for tanning gol using a solution of a ferric salt of iron and acetic sodium salt, DIFFERENT THAT, acetic acid and table salt are added to this solution of an iron salt, such as ferric chloride or iron ammonium alum and acetic acid salt. 2. Acceptance of the method according to claim 1, characterized by the fact that the solution was injected with an acetic sodium salt solution of at least 440 o / o from the weight of the iron salt taken, calculated as oxide. 3. Acceptance of the method according to paragraphs. 1 and 2, characterized in that the tanning of a cannon is combined with the subsequent retanning with known mineral or artificial tanning agents, including sulphite-cellulose extract. 4. Application of sodium hyposulfite to neutralize the mol treated with the method described in paragraphs. 1-3.