CS264834B1 - Process for treatment of pelt - Google Patents

Abstract

The problem of convenience is addressed boots for the production of harmless leather and waste after mechanical treatment. The essence of the solution is that initiation is performed once or in bath stages of 10 to 200% relative to the weight of the boot containing 0.1 to 12 wt. titanium and / or zirconium in the form of compounds having a tanning action, or. \ t aluminum in the form of boat compounds and aldehydes, or mixtures thereof in any ratio, up to 10 wt. neutral salts for 1 to 6 hours.

Description

It is an object of the present invention to provide a process for treating a wort in which, after pickling or application, the wort is treated with chromium-free reagents, machined and rendered.

During the processing of leather into leather, the useless skin is mechanically removed by trimming, shaking or shearing. Said operations are usually carried out after the tanning operation. If not, it is necessary that the clearing is treated by pretreatment or tanning. Methods for pretreatment with chromium or aluminum compounds or combinations thereof are known. Generally, pretreatment procedures are known using, for example, formaldehyde, glutaraldehyde or pretreatment with both natural and synthetic tannins. The disadvantage of these processes is the generation of unwanted wastes, for example, the aluminum content of the wastes makes it easy to wash out and does not allow storage of protein waste, the presence of Cr (III), which can be oxidized to toxic Cr (VI) and difficult to remove from waste. The disadvantage of pretreatment with aldehydes or tannins is their health, which does not allow waste recovery. In the pretreatment with glutaraldehyde, a disadvantageous dyeing of the leather results. Furthermore, methods for treating the wort are known, in which, in the first step, the wort is treated in the final phase by chromofining or tannery. Before or after tanning, the leather is treated with basic aluminum polychloride. The second method is characterized by pretreatment of the holin in the bath containing soluble salts of manganese, cobalt, nickel, titanium or zirconium. Another known method of treating the ground is that after decalcification and washing, the ground is picked up with a waste solution after tanning containing zirconium and titanium compounds, then the chromium leather is treated and subsequently treated with zirconium and / or titanium compounds with ammonium sulphate added. machined. It is also known to produce grain leather and split leather, which is pretreated with a chromium-free mixture of aldehydes. The pre-tanned leather was chipped to give intermediates which were disintegrated and chrominated on leather. The advantage of this method is continuous production, energy saving and improvement of leather quality. However, the content of organic substances in waste and its demanding treatment is disadvantageous.

The above-mentioned disadvantages are largely eliminated by the method according to the invention, characterized in that the tanning is carried out once or in stages in a bath of 10 to 200% by weight, based on the weight of the wort containing 0.1 to 12% by weight. % of titanium and / or zirconium in the form of their tanning compounds, or aluminum in the form of tanning compounds and aldehydes, or mixtures thereof in any ratio, up to 10% by weight; neutral salts for 1 to 6 hours.

The technical effect of the invention is that after mechanical treatment of the tan leather as described above, white health-friendly waste is produced with the possibility of using their protein and nitrogen components, in particular as feed and fertilizer. Wastes can be stored as long as no toxic or other harmful substances are released. Light to white leather was prepared, with the option of adjusting to any shade with a touch from the driest to the greasiest. Leather may be tanned by conventional tanning agents, but in some cases may not be tanned at all. This is particularly important for lining leathers, which are intended to be harmless to health as they come into contact with the skin. Further advantages of the process according to the invention are to increase the uniformity of the coloring of the leather and to reduce the consumption of the auxiliaries in the wet treatment as well as in the finishing of the leather, while maintaining the quality of the leather.

The method of treating the wound is further illustrated by the following examples, in which the amounts of the individual components are given in percent by weight, based on the weight of the wort.

EXAMPLE

The tanning drum was dosed with calf washed after pickling. 30% water,% sodium chloride was added and the barrel was rotated for 10 minutes. Then, in the first stage, the clearing was tanned with aluminum sulphate in an amount corresponding to 1% aluminum and the barrel was rotated for 10 minutes. In the second stage, a tanning titanium salt was added in an amount corresponding to 5% titanium and the barrel was rotated for 5 hours. The leather was unloaded and left to lie for 16 hours. After this time, the leather was chipped and tied to the desired depth and loaded into a tannery barrel where it was tanned, neutralized and processed by wet pre-treatment operations.

Example 2

Pigs washed after pickling were dosed into a tanner barrel. 150% water,% ammonium chloride was added and the barrel was rotated for 30 minutes. Thereafter, the clearing was tanned with a titanium salt having a tanning effect of 8% titanium and the barrel was rotated for 4 hours. Next, the leather was unloaded and left to sit for 16 hours and treated as in Example 1.

Example 3

Pickled beef was dosed into the tannery barrel. Then, in the first stage, the clearing was started in a sawdust bath with the addition of zirconium salt with a tanning effect amounting to 2.5% zirconium and the barrel was rotated for 30 minutes. In the second stage, the titanium base salt was added in an amount corresponding to 4% titanium and the barrel was rotated for 2.5 hours. Next, the leather was unloaded and left to sit for 16 hours and treated as in Example 1.

Example 4

The tannery barrels were dosed with pork processed according to the usual technological procedure, up to the washing operation after pickling. 100% water was added and the clearing was started by adding 3% formaldehyde in the first stage and the barrel was rotated for 2 hours. In the second stage, aluminum sulfate was added in an amount corresponding to 1% aluminum and the barrel was rotated for 1 hour. Next, 2% sodium bicarbonate was added and the barrel was rotated for 1 hour, then 0.6% urea was metered in and the barrel was rotated for 30 minutes. The leather was removed from the barrel and left for 24 hours and treated as in Example X.

Example 5

The tanners were dosed with pork processed according to the usual technological procedure up to the washing operation after pickling. 100% water was added and the clearing was started in the first stage by adding 3% formaldehyde and the barrel was rotated for 120 minutes. In the second stage, an aluminum salt with tanning effect was added in an amount corresponding to 1 Ϊ aluminum and the barrel was rotated for 60 minutes. Titanium and zirconium salts having tanning effects were then added in amounts corresponding to 4% titanium and 3% zirconium and the barrel was rotated for 3 hours. The addition of sodium bicarbonate deteriorated the barrel to pH 4. Leather was removed from the barrel and left to sit for 16 hours and treated as in Example 1.

Claims (1)

OBJECT OF THE INVENTION A method of treating the ground, whereby the ground is treated with chromium-free reagents ¹ after pickling or pickling, and is characterized in that the ground is carried out once or in stages in a bath of 10 to 200%, based on the weight of the ground. containing 0.1 to 12% by weight of titanium and / or zirconium in the form of tanning compounds or aluminum in the form of tanning compounds and aldehydes, or mixtures thereof in any proportion, up to 10% by weight of neutral salts for 1 to 6 hours .