SU732390A1 - Method of leather tanning - Google Patents

Description

The invention relates to the leather industry and can be used for tanning leather. There is a known method of skin treatment, which consists in the fact that the semi-finished product, after the preliminary preparation of the oak, is made of zirconium compounds with subsequent fixation of zolconium oxide with cationic fat}. The disadvantage of this method is that the fixation of zirconium salts uses expensive cattle fat, which does not ensure the complete fixation of salts of cupcakes. The aim of the invention is to improve the quality of the skin while simultaneously reducing the cost of the process. The goal is achieved by the fact that in a known method, which includes preliminary preparation of a mole, zirconium tanning and subsequent fixation of zirconium salts, fixation is carried out with sodium naphthenate in an amount of 3-5% by weight of the skin. The skin production is carried out as follows. Washed non-nickel sheepskin, treated with kerosevic emulsion for 45-6 O min. Then, the low basicity extract is chromized with an extract of low basicity (18-2O% in terms of chromium oxide) in an amount of 0% by weight of ghel in the same solution for 1.52 hours at a temperature of 25-30 ° C. The skin welding temperature after tanning is 75-8 ° C. Pickling is performed at that. the same solution at the next consumption of materials, in% by weight of the skin: Ammonium sulfate 5 Sodium chloride 2 Acetic acid (7O%) 0.5 Sulfuric acid {1O%) 1.5 Acids dissolved in water (vtchapa acetic, then Sulfuric

1O Mill after the introduction of salts. Duration of pickling 30 min.

Further, in the same solution, woolen tanning is carried out with a tanning rate of 2-2.5%, calculated on zirconium dioxide. The duration of the double is 3 hours to a temperature of CBapj-geani skin 9O-9b ° C. PH oak of this solution 1.51, 8. In order to ensure the fixation of zirconium salts in the skin, after tanning, the leather is treated for 1 hour with sodium naphthenate in an amount of 3-5% by weight of the skin. Then the skin is washed with water at a temperature of 28-30C and neutralized with a solution containing in% by weight

skin:

Urotropin1

Sodium Hyposulphite 0.5 Duration of neutralization 4560 min. At the end of the neutralization of the pH of the leather. 4.5-5.0. Subsequent washing, painting, unloading, lining, laying, priming with white acrylic paint, drying and further finishing of leather of zirconium tanning is carried out according to the method of working out leather of chrome tanning from sheepskin and goatslin.

The use of sodium naphthenate as a fixer for zirconium salts contributes to more than half of the fixation of zirconium salts in the skin than when fixed with cationic H1F.

Table 1 presents the zirconium content in terms of 7. in oggngnyh and control samples of sheepskin leather.

The results of the analysis show that sodium naphthenate, combined with zirconium salts, is not removed from the skin during treatment with water for 6 minutes.

Table 2 presents the indices of skin strength with the fixation of zirconium salts with sodium naphthenate (experimental) and cationic Zh1fom (control). In addition, zirconia tanning leathers with the fixation of zirconium salts with sodium naphthenate are less exposed to the shafts than tfi used cationic fat.

Table 1

Table 2

 Strength at

Samples gap kg / strength

1.06

Experienced 0.97 Controls

Claims (1)

1. USSR author's certificate number 478061, cl. C 14 C 3/04, 1975.