CS199137B1 - Synthetic lubricant for semichrome leathers - Google Patents

Description

(54) Synthetic lubricant for semi-chrome leather

The subject of the invention is a synthetic lubricant for semi-chrome leather.

Previously, natural fatty substances were used for lubrication. With the development of chemical and tanning technology, these substances have been formulated for application from the aqueous phase to emulsion form. In order to form the necessary emulsion, free emulsifiers, mainly soaps, were first added to the free fatty substances, the use of which had a number of disadvantages. In the further development of the lubricant formulations, emulsifiers were drawn directly from part of the fat component by introducing a polar group. The polarity is increased by sulfation.

The sulfate group is relatively unstable, poorly resistant to bath temperature and easily hydrolysed in an acidic environment. The advantage of sulphated substances is easy preparation of lubricating emulsions and good depletion of liquor baths. The disadvantage is lower penetration of fat components into the center of the leather mass. In order to increase the softness of the leather, it was necessary to increase the penetration of the lubricating component, which was made possible by the introduction of a more stable polar group.

Sulfated materials containing a very stable sulfo group are suitable for this purpose.

However, the effect of this stable group is manifested in reduced depletion of the liquor bath. By a suitable combination of sulphated and sulphated components it is possible to achieve increased penetration of liquor emulsions into the leather mass, while achieving high fat depletion from liquor baths.

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The disadvantage of natural fat labels is their constantly decreasing availability. Replacement of natural fatty substances is commonly performed on synthetic or semi-synthetic lubricants with oxidized paraffin, chlorinated paraffin, chlorinated lard, polypropylene oil, etc. (U.S. Patent No. 86721, U.S. Patent 156996). Synthetic lubricants, which contain synthetically prepared esters, higher fatty acids and lower mono- and polyhydric alcohols, are the closest to the properties of natural fats. .

Particularly good results in the lubrication of eemichromite leather can be achieved by using the synthetic lubricant according to the invention, characterized in that it is a homogeneous mixture.

to 70% by weight sulfltovaného fat fraction with a content of 0.5 to 5% by weight of organically bound SO, containing 30 to 40% by weight pentaerytrittetráolaátu, 18 to 24% by weight of a mixture of fatty acids _C12-2-one saturated unsaturated with one to three double bonds, 12 to 16% by weight glyeeridů these acids, from 15 to 25% by weight oxidized paraffin wax having an acid number of 75-110 mg KOH / g with 60% by weight aulfatovaného optionally eulfltovaného ester jeďnomoených alcohols to C ^ gs fatty acids, C ^ ₂ ^ 24 ^{NA3 price} y ^ L ^m and unsaturated with one to three double bonds, having from 2 to 6.5% wt organically bound SO.j and 30% by weight of mineral oil parafinlckých.

The sulphite content increases the penetration of fat components into the leather mass. Synthetic substances show an increased affinity of the fat components for the skin. Esters of alcohol-intensive alcohols increase the resistance to dry-cleaning and increase the brightness of the colors of natural leather. Synthetic fat constituents increase overall leather strength, reduce specific gravity and increase color fastness. These synthetic lubricants will find use in the leather industry.

Example 1

50 parts by weight of the sulphite component comprise 35% by weight of pentaerythritetraoleate, 18.6% by weight of a mixture of C ^ ₂ θ24 saturated and unsaturated β one to three double bonds, 15% by weight of glycerides of these fatty acids and 15% by weight of the oxidized 42 parts by weight of sulfated methyl ester of a fatty acid mixture up to 24% containing 25.6% by weight saturated and 74.4% by weight unsaturated with one to three double bonds and 8 parts by weight of mineral oil are added to the paraffin. The resulting mixture was perfectly homogenized by heating and adjusted to pH 6.4 with ammonia water. The liquor oil thus prepared is suitable for the sacrificing of bag leather or as part of a liquor mixture for the manufacture of clothing and glove leather.

Ϊ́ Example 2 To 40 parts by weight sulfonated component containing 33.3% by weight penťaorytrittetraoleátu ^ O wt% fatty acid mixture of C ^ g "2 ₂ C 4 saturated and unsaturated with one to three double bonds, 13.1% by weight of such fatty acids glyeeridů and 16.7 wt% paraffin výšeoxidovaného was added 35 parts by weight of methyl suífatovaného mixtures of fatty acids containing _{from 4} to C 21.2% SAFA and 78.8% by weight of unsaturated with one to three double bonds, and 25 parts by weight of mineral oil the resulting mixture * The mixture is completely homogenized by stirring and the pH of the mixture is adjusted to 6.9 with ammonia water. The liquor oil prepared in this way is suitable for lining leather or as part of a liquor mixture for the manufacture of clothing and glove leather. *

Claims (1)

OF THE INVENTION w Synthetic lubricant for semi-chrome leather, characterized in that it consists of a homogeneous mixture 40 to 70% by weight of sulfated fat content containing 0.5 to 5% by weight of organically bound SO4 containing 30 to 40% by weight of pentaerythritetra oleate, 18 to 24% by weight of mixtures of fatty acids C5 to C8 saturated and unsaturated with one to one three double bonds, 12 to 16% glycerides of these acids, 15 to 25% oxidized paraffin with an acid number of 75 to 110 mg KCH / gs 20 to 60% by weight of a saturated or unsaturated monohydric ester of monohydric alcohols up to ΟΟ θ and Cnými a až Cggggg fatty acids saturated and unsaturated with one to three double bonds containing 2 to 6.5% by weight of organically bound SO ^ as 5 to 30% by weight of mineral paraffin oils.