CS233232B1 - Method of activated tanning - Google Patents

Abstract

The invention falling within the field of the leather industry relates to the properties of activated 81-nen. The essence of the activated Clening according to the invention lies in this. The decalcified waste is impregnated with urea in the amount of 0.1 to 30% by mass. to the weight of the stubble. After tanning, 0.1 to 0.2 g/1 of chromium oxide remains in the chapel, based on 100% of the pile.

Description

2 233232

BACKGROUND OF THE INVENTION The present invention relates to a process for activating an active agent with base chromium and aluminum salts. Nowadays, in the tanning industry for mineral tanning, the base salts of chromite and aluminum are used. The disadvantage of these processes is that large amounts of chromium and aluminum salts go to waste leaders. For this reason, technologies have been designed that can significantly reduce the amount of milky substances in the bath after cleansing. Significant compounds of these compounds can be achieved by using amides of aliphatic carboxylic acids together with ethoxylated aliphatic carboxylic acids.

Conventional pickling systems reduce collagen reactivity prior to Sinenl suppression of carboxyl ion ionization. The prooesome is negatively influenced by the behavior of the number of mllegal aolls found in the bath after tanning.

The principle of activating the action of the base with chromium and alumina salts is the addition of alkylolamides of aliphatic carboxylic acids having carbon numbers of 8 to 30 or their quaternary salts and beta-hafthalenesulfonic acid according to the invention in that 0.1 to 0.1% is treated with urea. 30 wt. the weight of the boot. In the process according to the invention, the tannin is treated with alkylolamides of aliphatic carboxylic acids having a carbon number of 8 to 30, optionally with quaternary sol, with urea prior to tanning. Thereafter, beta-naphthalene sulphonic acid is dosed to modify the amino-conjugate followed by tan chromium or alumina salts. The urea present is partly destroyed by the acidity of the mineral salts and the temperature produced by the movement of the leather.

The effect of the formation of carbonate and ammonia coke by the decomposition of urea can be increased by the use of ureas, e.g. The process is followed by tanning. If no recycling is carried out, tanning is terminated by bleaching with sodium bicarbonate, calcium carbonate, magnesium or their oxides. In the case of recycling, the tanned bath may be used to initiate the treatment of the lower dose of the wound. Tanned leather is ready for mechanical operations. In the bath, 0.1 to 0.2 g / l of Cr 3 O 2 based on 100% bath remains. Example 1 i

Urea activates collagen by cleavage of hydrogen bonds and thereby enhances the binding of milky substances. After acidification with the shrub and elevated temperature, the urea decomposes into carbon dioxide and ammonia, causing the fibrous structure of the collagen to agitate and improve the physico-mechanical properties of the skin. Due to the breakdown of the fiber structure of collagen, it is possible to produce soft leather with fewer lubricants.

Stained stain and cleared over stains. 0.5% by wt. % nonionic surfactants (a mixture of aliphatic carboxylic acid di-triethanolamides 80%, oxyethylated castor oil 10%, oxye-coconut coconut oil 10%) and 22% w / w. ureas based on the weight of the boot. After 30 minutes of movement, 1% beta-naphthalenesulfonic acid is added followed by 30 minutes.

Then add a 12% solution of basic chromium salts of 150 g / l CrgO 2 Z to 33%. To blunt, 0.8 KaACO 2 and 10% water are added. After 60 minutes of movement, the leather is tanned and ready for mechanical operations after being removed.

After tanning, 0.2 g of CrpO4 /. based on 100% bath.

Claims (1)

OBJECT OF THE INVENTION Method of activated tanning of base with chromium and aluminum salts with addition of alkylolamides of aliphatic carboxylic acids having carbon numbers of 8 to 30 or their quaternary salts and beta-naphthalenesulfonic acid, characterized in that the descaled clearing is treated with urea in an amount of 0.1 to 30% wt. to the weight of the ground.