CS250535B1 - Synthetic lubricant for semi-chrome leather - Google Patents

Abstract

The purpose of the solution is a synthetic lubricant for semi-chrome leather, which enables the processing of waste fats for tanning purposes. The purpose was achieved by a synthetic lubricant containing 20 to 60% by weight of the sulphitated portion, 1 to 30% by weight of paraffinic and/or polyolefinic hydrocarbons, 20 to 70% by weight of the sulphated portion and water.

Description

The invention relates to a mixed sulphated and sulphated lubricant for lubricating semichromous leather.

There is a considerable amount of animal fat which cannot be processed into tanning lubricants by sulphation and sulphation due to the high saturated fatty acids bound in triacylglycerols, since the resulting products are not suitable for the lubrication of leather. Only very low proportions of these fats can be processed in blended lubricants, the presence of which is manifested by low stability in the form of an oil-in-water emulsion, and after application the skin rash is caused by crystallization. Of these, these fats are processed outside the tanning industry.

It has now been found that the above-mentioned disadvantages are overcome by the synthetic semi-chrome leather lubricant according to the invention, characterized in that it consists of up to 60% by weight. sulfite containing ammonium and / or sodium and / or ethanolamine salts containing organically bound SO _{: t} min. 0.5% with a composition of 0.1 to 50 why. wt. 1-mono and / or 2-monoacylglycerol and / or 1,2-diacylglycerol and / or 1,3-diacylglycerol and / or triacylglycerol, wherein acyl- is a C 10 to C 22 saturated and unsaturated fatty acid residue; % of unsaturated C 10 to C 22 fatty acids with C 1 to C 12 aliphatic alcohols, with an excess of these alcohols up to 50% by weight; or mixtures of these substances,

0.1 to 50 wt. a mono- to tetra-ester of unsaturated fatty acids having one to three C 10 to C 22 double bonds with C 1 to C 12 alcohols or mixtures thereof,

0.1 to 30 wt. mixtures of saturated and unsaturated fatty acids with one to three C 12 to C 24 double bonds,

0.1 to 30 wt. mixtures of triacylglycerols of saturated and unsaturated fatty acids with one to three C 12 to C 24 double bonds,

0.1 to 25 wt. oxidized paraffin with an acid number of min. 50 mg KOH / g, up to 30 wt. % paraffinic and / or polyolefinic hydrocarbons, up to 70 wt. a sulfated moiety containing ammonium and / or sodium and / or ethanolamine salts containing organically bound SO _; 2% composition

0.1 to 99% w / w; mixtures of C 1 to C 12 monohydric esters with C 12 to C 24 fatty acids saturated and unsaturated with one to three double bonds,

0.1 to 60 wt. mono- to triacylglycerols of these fatty acids or a mixture of these and water.

The advantage of the synthetic lubricant according to the invention is that it is possible to process tanning waste fats for tanning by sulphitization, after pre-treatment by re-esterification, alone or in mixed lubricants.

By re-esterification a mixture of acylglycerols and fatty acid monoesters contained in waste tanning fats, dissolved in an excess of alcohol used for re-esterification, is prepared, which is processed in mixed lubricants by sulfitation. Reesterification reduces the freezing point of the esters formed to the freezing point of natural fats used in tanning. Lubricants prepared in this way are a full-fledged substitute for the tanning lubricants used hitherto, moreover, the sulphite component allows a higher penetration of the fat content into the leather mass and shows an increased affinity for the skin mass. Esters of monovalent alcohols increase the resistance to dry cleaning and increase the brightness of the colors of natural leather. Synthetic proportions increase the overall strength of the leather, reduce the specific weight and increase the light fastness of the leather.

Example 1

a) Re-esterification cuticle fat pork lard melted butanol dodecylbenzenesulfonic acid parts by mass 25 parts by weight 35 parts by weight

parts of mass

The re-esterification is carried out in a boiler equipped with a stirrer and indirect heating at 80 to 90 ° C for 4 to 16 hours.

bj Sulphite mixture of esters according to item a 35 parts by weight. mixture of saturated and unsaturated fatty acids of C 12 to C 24 with one to three double bonds and their triacylglycerols in a ratio of 1: 1 wt. 30 parts by weight

pentaerythritetraate 5 parts by weight.

oxidized paraffin o.

mg KOH / g 15 parts wt.

Sulfitization is carried out in the first phase by oxidation of the fat batch by compressed air with catalysis of the organic cobalt salts at a temperature of 80 to 100 ° C for 2 to 24 hours, in the next phase by sulfitation with a solution of 10 parts by weight. sodium bisulfite, 0.5 parts by weight of sodium bisulfite; ethanol, 0.2 parts wt. % dodecylbenzenesulfonic acid and 40 parts by weight of dodecylbenzenesulfonic acid; water for 24 hours under atmospheric oxygen catalysis at 90-100 ° C. After the sulfitation is complete, the aqueous phase is drained. cj Finalization of the sulfated fat fraction according to b) 40 parts by weight.

bearing oil 20 parts wt.

a mixture of sulphated methyl esters of saturated and unsaturated fatty acids of C 12 to C 24 with mono-to-triglycerides of these acids 40 parts by weight

Finalization is accomplished by neutralization with 25% ammonia water to a pH of 6.8 to 7.6. The product thus prepared forms stable O / W emulsions at 20 ° C at a concentration of 10% for 24 hours.

Claims (1)

SUBJECT Synthetic lubricant for semi - chrome leather characterized by: 20 to 60 wt. sulfite containing ammonium and / or sodium and / or ethanolamine salts containing organically bound SO _: > min. 0,5% of composition 0.1 to 50 wt. 1-mono- and / or 2-monoacylglycerol and / or 1,2-diacylglycerol and / or 1,3-diacylglycerol and / or triacylglycerol, wherein acyl- is a C 10 to C 22 saturated and unsaturated fatty acid residue, saturated monoesters and C 10 to C 22 unsaturated fatty acids with C 1 to C 12 aliphatic alcohols, with an excess of these alcohols up to 50% by weight. or mixtures of these substances, 0.1 to 50 wt. a mono- to tetra-ester of unsaturated fatty acids having one to three C 10 to C 22 double bonds with C 1 to C 12 alcohols or mixtures thereof, 0.1 to 30 wt. mixtures of saturated and INVENTION saturated fatty acids with one to three C12 to C24 double bonds, 0.1 to 30 wt. mixtures of triacylglycerols of saturated and unsaturated fatty acids with one to three C 12 to C 24 double bonds, 0.1 to 25 wt. oxidized paraffin with an acid number of min. 50 mg KOH / g 1 to 30 wt. paraffinic and / or polyolefinic hydrocarbons, 20 to 70 wt. sulfated moiety containing ammonium and / or sodium and / or ethanolamine salts containing organically bound SO.n min. 2% composition 0.1 to 99% of a mixture of C 1 to C 12 monohydric esters of C 12 to C 24 fatty acids saturated and unsaturated with one to three double bonds, 0.1 to 60 wt. mono- to triacylglycerols of these fatty acids or a mixture of these and water.