CS199136B1 - Asemisynthetic lubricant for chrome tanned and semichrome leathers - Google Patents

Description

SUMMARY OF THE INVENTION The present invention provides a semi-synthetic lubricant for chrome-plated and ehemlehromite leather.

Previously, natural fatty substances were used to lubricate the ears. 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 lubricating preparations, emulsifiers were formed directly from part of the fat component by introducing a polar group. 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 sulfatoyanated 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. For. 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.

Sulphite-containing substances containing a very stable e-sulfospline are suitable for this purpose. However, the effect of this stable group is manifested in reduced depletion of the liquor bath.

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By a suitable combination of sulphated and sulphitorated components it is possible to achieve increased penetration of liquor emulsions into the leather mass while achieving high fat depletion from liquor baths.

In the case of semi-synthetic tanneries (lubricants and surfactants), ee is based on the partial replacement of natural fatty substances with synthetic raw materials such as oxidized paraffin, chlorinated paraffin, chlorinated fats and oils, esters of lower alcohols to unsaturated fatty acids, non-ionic ethoxylates of higher fatty acids, alcohols or alkylphenols, and the like, wherein the resulting mixture of synthetic and modified natural substances is generally a full-featured replacement for most of the tanneries based on natural; raw materials.

Particularly good results in the lubrication of crushed and eemichromite leather can be achieved using a semi-synthetic lubricant consisting of a homogeneous mixture.

up to 79% by weight of a sulfated fat content of 0.5 to 5% by weight i

organically bound SO-j containing 30 to 40% by weight of pentaerythritetra oleate, 18 to 24% by weight of a mixture of C18-Cg4 saturated and unsaturated fatty acids with one to three double bonds, 12 to 16% by weight of glycerides of these acids, 15 to 25% by weight of oxidized paraffin from about 79 to about 110 mg KOH / g of β to about 60% by weight sulfated fatty acid glycerides and from about 14 to about 20 carbon atoms of hydroxyleeline containing from about 2 to about 6.5% organically bound SO3.

The sulphite content increases the penetration of fat components into the leather mass. Synthetic substances show an increased affinity of the fatty substances for the skin.

Kraft natural fat fractions increase the depletion of liquor baths and give the leather a characteristic feel. The composition according to the invention finds use in the leather industry.

He did

To 50 parts by weight of an eulfite component containing 39% by weight of pentaerythritetraoleate, 18.6% by weight of a mixture of fatty acids C18 to ^and unsaturated with one to three double bonds, 19% by weight of glycerides of these fatty acids and 15% by weight of the above oxidized paraffin by weight of eulphated fish oil and 19 parts by weight of eulphated castor oil. The resulting mixture was perfectly homogenized by stirring and adjusted to pH 6.8 with ammonia water. The liquor oil thus prepared is suitable for the liquorice of bag leather or as part of a liquor mixture for the manufacture of garment and glove leather.

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Example 2

75 parts by weight of a sulphite component containing 33.3% by weight of pentaerythritetra oleate, 20% by weight of C ₁₂ to 24 24 ^on saturated and unsaturated fatty acids with one to three double bonds, 13.1% by weight of glycerides of these acids,

16.7% by weight of the above oxidized petroleum paraffin are added 17 parts by weight of sulphated fish oil and 8 parts by weight of sulphated castor oil. The resulting mixture is perfectly homogenized by stirring and the pH of the mixture is adjusted to 6.4 with ammonia water. The liquor oil thus prepared is suitable for liquor clothing velor and wübhk.

Of the invention

Claims (1)

Of the invention Semi-synthetic lubricant for chrome-tanned and semi-chrome leather, characterized in that it consists of a homogeneous mixture 40 to 75% by weight sulfitovaného fat fraction with a content of 0.5 to 5% by weight of organically bound SO ^ containing 30 to 40% by weight pentaerytrlttetraoleátu, 18 to 24% by weight of a mixture of fatty acid _C-2 to _C-2 saturated. unsaturated with one to three double bonds, 12 to 16% by weight of glycerides of these acids, 15 to 25% by weight of oxidized paraffin having an acid number of 175 to 110 mg KOH / gs 20 to 60% by weight of sulfated fatty and glycerides 20 carbon atoms in the chain containing 2 to 6.5% by weight organically. bound SOy