The method of tanning skins

 

(57) Abstract:

The method applies to tanning leather. Sheepskin process mediaprovodami of metacid-guanidine. The technical result is significant savings in water and chemicals, environmental improvement process and its intensification. table 2.

The invention relates to light industry, namely, fur production, and can be used for tanning of fur and fur sheepskin.

Known methods of tanning skins, when instead pikelny preparation processing of semi-finished resin before chrome-tanned (Loseva E. C., Sankin L. B. treatment Effect dicyandiamide the resin DAS-2C on tanning fur sheepskin without preliminary pickling.//Izvestiya Vuzov. The technology of light industry. - 1987. - N5).

The closest in technical essence of the present invention is a method of processing a sheepskin resins without chromium compounds (Kurbatova L. N., Fears And. P. Tanning fur sheepskin dicyandiamide resins. //Ref. collection of "Fur prom-th" vol.2. - M: Chigariro, 1972). The temperature of the welding reaches in this case, values of more than 80oC, the strength of the leather is increased without reducing tague process, its intensification.

This goal is achieved by the fact that as a tanning agent is metaloprokatniy of metacid. Metarepresentation - oligomer with a molecular weight of 8-10 thousand.E., possessing bactericidal properties, and after interaction with formaldehyde - tanning action. Savings tanning material and water is due to the re-use of tanning agent solution without compromising the quality of the semifinished product.

The proposed method consists in the following.

Fur semi-finished product after washing and enzymatic processing with the addition of protocolin G-SX handled well.to. 8 and constant rotation of the device within 4-6 hours when parameters: temperature 20-25oC, pH 6-7. Metaloprokatniy of metacid dispensed at one time in the amount of 5-10 g/l, counting on the dry matter (about 25%). After tanning organic tanning agent is flushing. Further processing is carried out according to standard methods.

The spent tanning solution is brought water to the desired value W.K. in each cycle is added to 25% tanning substances (from the original number). Thus, you can save up to 60% of tanning agent and water.

T Chemical analysis and physical testing fur semi-finished product showed that it fully complies with the standard values (table. 2).

The method of tanning skins, consisting of synthetic tanning tanning substance, characterized in that as tanning substances used methylol derivative metacid-guanidine.

 

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FIELD: coal-chemical products.

SUBSTANCE: weathered vitrinite brown coals from Baga-Nursk coal field having ash level 36-48% and moisture 20% are ground to granule size 0.5-0.9 mm. Resulting powder us sulfurized for 6-8 h with 98% sulfuric acid at 60-80°С and coal-to-acid weight ratio from 1:3 to 2:3. Sulfurized coal is neutralized and treated with 10-15% sodium hydroxide aqueous solution at weight ratio of alkali solution to initial coal (10-15):1 to form water-soluble sodium sulfohumate, after which water-soluble residual coal is separated by centrifugation. Centrifugate is mixed with 10-15% aqueous hydrochloric acid at volume ratio (10-15):6 to form precipitate, which is allowed to settle into compact form during 40-60 min. After decantation of liquid phase, solid residue is partially dried at 40-60°С until pasty mass is obtained.

EFFECT: increased content of tanning substances in humate-containing compounds and enabled utilization of oxidized brown coal in open-cut production of brown coals.

4 tbl, 5 ex

FIELD: light industry.

SUBSTANCE: invention relates to a method for treatment of fur hides before oxidative whitening of hair cover. Additional tanning and pickling are carried out separately at pH value 6.5-7.0. The preparation based on low-molecular alcohol polyacetals - "Dubitel M" is used as a tanning agent. Tanning agent is added for two steps wherein at the second step tanning agent is added in twice dose as compared at the first step. Additional tanning is carried out in the required ratio of components of an aqueous composition comprising sodium chloride, surface-active substance, preparation based on low-molecular alcohol polyacetals. Pickling is carried out with smearing on hair cover in the consumption 2-4 ml per 1 dm2 with the composition comprising iron sulfate, citric acid, surface-active substance and gelatin as a protecting additive. After pickling lying is carried out for 12-16 h. Method provides improved the quality of whitened fur hides.

EFFECT: improved method for treatment.

2 cl, 2 tbl

FIELD: leather industry.

SUBSTANCE: solution is designed for use in furriery and clothing manufacture when performing correction of fur fells and cuttings of fur clothing. Solution contains sodium chloride, glycerol as plasticizer, inorganic and organic tanners, potassium alums, glyoxal, and water.

EFFECT: maximized area of fells and improved their quality.

2 cl, 1 tbl

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