CS200005B1 - Synthetic lubricant for chromo and semichromite tanned leather with complexoactive effects - Google Patents

Description

SUMMARY OF THE INVENTION The subject of the invention is a synthetic lubricant for chrome-tanned and semi-chrome leather with complexoactive effects.

Natural fat substances have previously been used to lubricate leather. With the development of chemical and tanning technology, these substances have been formulated for application from the aqueous phase to emulsions. 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 a further development of lubricating formulations, emulsifiers were formed directly from part of the fat component by introducing a polar group. The polarity is increased by sulfathoate.

The sulfate group is relatively unstable, poorly resistant to the effects of bath temperature, and easily hydrolysed in an acidic environment. The advantage of the sulfated compounds is the easy preparation of emulsions and good depletion of liquor baths. The disadvantage _: lower penetration of fat components into the center of the leather mass. 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 liquor baths.

With a suitable combination of sulfated components, an increased penetration of the emulsion into the leather mass can be achieved with a high fat depletion from the liquor bath.

The disadvantage of natural fatty substances is their constantly decreasing availability.

200 005

200 OOS

Natural fat replacements are commonly carried out with synthetic or semi-synthetic lubricants with oxidized paraffin, chlorinated paraffin, chlorinated lard, polypropylene oil and the like (U.S. Pat. No. 86,721, AO 156,996). Synthetic lubricants containing synthetically prepared esters of higher fatty acids and lower monohydric alcohols are the closest to natural fat.

Particularly good results in the lubrication of chromium-treated and semi-chromium leather can be achieved by using the synthetic lubricant of the invention, characterized in that it consists of a homogeneous mixture of 40 to 70% by weight of sulphated fat and contains 0.5 to 5% by weight. % organically bound fraction of SO4 containing 30 to 40 wt. % pentaerythritetraoleate 18 to 24 wt. mixtures of fatty acids, c ₂ C EŽ nasyoenýoh and unsaturated with one EŽ three double bonding lines, 12 to 16% by weight. % of glycerides of these acids, 15 to 25 wt. oxidized paraffin with an acid number of 75 to 110 mg KOH / g with up to 40% by weight, of a sulphated or sulphated ester of a C ₁ to C _{1 S} alcohol with C ₁₂ to C 24 fatty acids saturated and unsaturated with one to three double bonds containing 2 to 6 5% by weight, organically bound 30% and up to 30% by weight, the fat component mixtures contain from 1 to 12% by weight, phospholipids.

The sulphite content increases the penetration of the fat components into the leather mass. Synthetic substances show an increased affinity of the fatty substances for the skin. Esters of monohydric alcohols increase the resistance to dry cleaning and increase the brightness of the natural hues. Synthetic fat components increase the overall strength of the leather, reduce the specific weight and increase the fastness of the dyeing. The addition of phospholipids acts as an antioxidant, free emulsifier and enhances the complexoactive properties of liquor oil.

The composition of the invention finds use in the leather industry.

Example 1

50 parts by weight of the sulphite component comprise 30% by weight, pantearyl trietholeoleate, 24.5% by weight, mixtures of ^C 12 to G% 4 saturated and unsaturated fatty acids (1: 3 ratio of saturated to unsaturated), 10.5% by weight, glycerides these acids,

17.5% by weight, výšeoxidovaného paraffin were added 30 weight parts of a mixture of methyl esters and glycerides sulfatovanýoh mastnýoh acids C ^ _{2-0 2} 4 HAsycenýoh nenasyoenýoh and having one to three double bonds, 20 weight parts tukovýoh aliquots containing 8.7% weight of phospholipids. The resulting mixture was perfectly homogenized by stirring and adjusted to pH 6.8.

* i

Example 2

To 65 weight parts sulfonated components listed in Example 1 was added 20 weight parts of a mixture sulfatovanýoh optionally sulfitovanýoh methylesters and glyoeridů mastnýoh acids 0 ^ ₂ to nasyoenýoh and nenasyoenýoh with one to three double bonds, and 15 weight parts tukovýoh aliquots containing 6 1% by weight, phospholipids. The resulting mixture is homogenized by stirring and the pH is adjusted to 6.9 with ammonia water. The liquor oil thus prepared is suitable for liquefying very soft leather with a high fat content.

Claims (1)

Synthetic lubricant for chromium-plated and semi-chrome leather with complexoactive effects, characterized by a homogeneous mixture 40 to 70% by weight sulfitovaného fat fraction with a content of 0.5 to 5% w of organically bound SO ^, containing 30-40% w pentasryttetraoleátu, 18 to 24% by weight of a mixture of fatty acid C ₁₂ to 0 _24, or not saturated with one to three double bonds, 12 to 16% by weight of glyoerides of these acids, 15 to 25% by weight of oxidized paraffin with an acid number of 75 to 110 mg KOH / gs 20 to 40% by weight of an optionally sulfated ester sulfitovaného jednomoonýoh alcohols C ₁ to C _1s' e 0 fatty acids _{12-0 24} saturated and unsaturated with one to three double bonds, containing from 2 to 6.5% by weight of organically bound S0 ₃ and 10 to 30% by weight of a mixture of fat fractions containing 1 to 12% by weight of phospholipids