The method of processing of fur skins

 

(57) Abstract:

Usage: in the leather industry. The inventive fur skins it is greased with partial esters of a polyol with 3 - 22 hydroxyl groups and carboxylic acid with6-36in the amount of 50 to 400 g of fur on the skin. The impregnation is conducted for 1 to 3 hours. 1 C.p. f-crystals, 1 table.

The invention relates to the processing of fur skins, in particular to a method for processing fur skins by greasing by felting.

A method of processing of fur skins by fatliquoring a slice of greasing substance that contains as main components of wool grease and mineral oil [1] After the process of felting with application containing wool grease greasing agents and, if necessary, easy gouging, fur skins first subjected to solvent extraction, while mineral oil is almost quantitatively removed, whereas wool fat due to less solubility of extracted only to a small extent. Then fur skins are hauling to remove adhering thereto wool fat.

By greasing the felting using contains the ability to stretch, having a good grip. However, the use of wool fat fattening substances for felting fur skins is associated with several drawbacks. Operational properties of the treated fur skins depend on wool grease, a natural product with varying quality. Therefore, to obtain fur skins with consistently good performance properties must match the ratio of fat and mineral oil and/or the duration of the process of felting with quality wool fat. In addition, the application contains wool fat fattening substances requires the extraction of mineral oils with a solvent, such as halogenated hydrocarbons, causing the need for recycling solvent residue extraction. In addition, fur skins, processed containing wool grease greasing substances, have an unpleasant odor.

The objective of the invention is to develop a method of processing of fur skins greasing substance that gives the skin the operational properties of continuous quality without unpleasant after processing smell.

The problem is solved in the method of processing of fur skins, including LM is t partial esters of a polyol with 3 22 hydroxyl groups and carboxylic acid with 3 to 36 carbon atoms, while specified partial ester take in the amount of 50 to 400 g per fur pelt.

These partial esters are widely known. They can be used as emulsifiers (see Fette, Seifen, Anstrichmittel" 82, Nr.3, 1980, page 93 of 100).

As the preferred greasing agents apply the incomplete complex di - and triglyceridemia esters of carboxylic acids.

The fatliquoring process by felting fur skins is carried out at known temperatures in the range of 30 50oC.

Greasing the milling is carried out after tanning of fur skins, for example, its malke or percussion hammer malke. Greasing agents or applied on the skin before felting, or added in the process of felting. After felting the skins are subjected to a light planing known techniques (if felting't they already tanned, past easy planing, fur skins) and in the drum is subjected to the hauling sawdust moistened with water and wetting in order to remove adhering to the surface of the skins partial esters of fatty acids.

Fur skins, processed by the proposed method are very soft and flexible, are compared with the processed famous ways is when exposed to the heat.

The following example illustrates the invention.

Example.

Tanning known techniques, the past light gouges skins breeding rabbits its malke process one of the following fattening substances.

Greasing substance: monooleate diglycerin (according to the invention).

Greasing substance B: dioleate diglycerin (according to the invention).

Fattening ingredient: the product of esterification of 2.5 mol of butyric acid by triglycerides (according to the invention).

Greasing substance G: existing trade greasing substance consisting of 50 wt. wool fat and 50 wt. mineral oil (as per prototype).

On the fur-skin use 200 g greasing agents. Time felting is 2 hours and the temperature felting 33 40oC. After the processing of fur skins leave for aging during the night, and then hung to dry for 24 hours.

Further processing the processed fattening substances a, B or fur skins is held in the drum the one-hour hauling sawdust moistened with water and a small amount of wetting agent. Then used sawdust replace fresh the hour. After this processing is used sawdust replace dry sawdust and skins again subjected to the hauling for a further hour.

Processed commercially available greasing substance fur skins subjected to two -, three-minute extraction hexachlorethane, after which is carried out in a closed system a two-hour hauling in the drum sawdust moistened with water and a small amount of wetting agent.

After the process haulage processed fattening substances And G fur pelts served in the drum for protrack, where adhering to the skins sawdust removed within 30 minutes. After meskene on the bench fur skins subjected to the one-hour haul to dryer dry sawdust, and then in the dryer for protrack stick to the skins sawdust removed within 30 minutes.

The following table summarizes the data on quality characteristics of processed fattening substances And G fur skins.

1. The method of processing of fur skins, including impregnation fatten their substance and hauling, characterized in that as greasing agents use partial esters of a polyol with 3 2="ptx2">

2. The method according to p. 1, characterized in that the impregnation is conducted for 1 to 3 hours

 

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FIELD: tannery or furry production.

SUBSTANCE: the invention is pertaining to the field of tannery or furry production and may be used for a piece by piece treatment of a tanning, furry semi-finished product with emulsions of "water in oil" type. The device for impregnation of sheets contains a mounted on the frame bath with a working compound, in which a corrugated roller is dipped, and also a feeding and auxiliary conveyers and a smoothing roller, a supporting means with a resilient counterbody, an actuator, a tool for removal of a finished semi-product, a device for creation of a hydrodynamic wedge and a pinch roller for engagement of the ribbed roller with the feeding conveyor. The problem of the presented invention is - development of the device simple in its servicing with a high reliability allowing to realize the process of impregnation more efficiently with a possibility of its installation in an automatic production line.

EFFECT: the invention presents a device simple in its servicing, having a high reliability, more efficient realization of the process of impregnation, a possibility of its usage in an automatic production line.

2 dwg

FIELD: chemical technology.

SUBSTANCE: invention relates to greasing and emulsifying substances used in fur, leather and other branches of industry. Invention describes a method for deep sulfonation of oxidized vegetable oils, fats and their mixtures, and oxidized mixtures with the nominal viscosity value in the range 33-75 by viscosimeter VZ-4 at 20°C in their treatment with sodium sulfite. The process is carried out in system consisting of oxidized component or mixture of oxidized components, sodium sulfite, water and soap additives, carboxylic acid, phenol and copper (II) salt as a catalyst in bead mill of vertical type at temperature of environment up to practically complete ceasing or quantitative consumption of sodium sulfite and charge of the latter is calculated by the following formula: mNA2SO3 = 0.006 x mOX x (I.N.)OX wherein mOX and (I.N.)OX mean mass and iodine number of oxidized component or mixture of oxidized components, respectively. The mass ratio of oxidized component and water varies in the range from 1:4 to 1:2.5. Dosing additives with respect to oxidized component are following: soap, 2%; carboxylic acid, 4%; phenol, 2.5%. Oxidized flax, sunflower, soybean and cotton oils, oxidized fish oil and mixtures of vegetable oils with fish oil or pig fat are subjected for sulfonation reaction with air in regimen of intensive bubble bubbling at 105 ± 5°. Soaps in indicated system are represented by sodium stearate and sodium oleate and by reaction mixtures of practically quantitative alkaline hydrolysis of fats and vegetable oils also. Benzoic, oxalic, malonic and citric acids are used as acid, and sulfate, acetate and other water-soluble salts of copper (II) are sued as a catalyst dosed in the amount (2-7.5) x 10-4 mole/kg of the parent charge. The sulfonation reaction degree is 33-40%.

EFFECT: improved preparing method.

5 cl, 1 tbl, 16 ex

FIELD: tanning industry.

SUBSTANCE: process is conducted in vertical mill to which soot, induline, kerosene and diesel fuel are introduced. Then components are mixed and slow heating the apparatus and its content is started after which mixing is switched off and slow heating of mill content is continued. Upon expiration of said time, acids or their compositions, white spirit and fatty additive are introduced and chemical mass-exchange process is performed at spontaneously fixed temperature due to thermal effects of this process and natural cooling at the beginning and at the end, as well as due to forced cooling at intermediate stage characterized by high rates of temperature at maximum of 140-150°C. At the moment when forced cooling is discontinued, 0.5-1.5 h before discontinuation of mixing and beginning of withdrawal at temperature of 80-115°C, 43-52-% solution of aluminum salts and C10-C20 of carboxylic acids is introduced into product being prepared.

EFFECT: facilitated procedure; increased amount of product.

1 tbl, 15 ex

FIELD: leather industry.

SUBSTANCE: preparation of composition is conducted on vertical-type bead mill. Induline, kerosene, and diesel fuel are consecutively charged into mill before stirring mechanism is energized, after which apparatus and contents thereof are slowly heated. Stirring is then stopped for 1 h while slow heating of mill contents is continued. When specified time expires, carboxylic acid or acid mixture, white spirit, fat additive, and aluminum oxide or hydroxide are added. Mechanic stirring is then switched on and contents of the bead mill are ground and the process is carried out at spontaneously fixed temperature caused by heat effects of the processes and natural cooling. When temperature is lowered to 85-120°C, desired product is discharged.

EFFECT: simplified process and increased product discharge degree.

1 tbl, 19 ex

FIELD: process engineering.

SUBSTANCE: oil, fat or polymer is applied on leather in amount of less that 20%, preferably, less than 15%, particularly preferably less than 10%, per leather weight. Then leather is treated by compressed air. Carbon dioxide is used as compressed air, treatment if carried out at pressure below 70 bar and temperature below 25C. Leather is processed by compressed air unless leather weight is at least 1% smaller than its weight prior to applying oil, fat or polymer.

EFFECT: improved leather structure due to increased non-blocking property of molecules.

1 ex

FIELD: chemistry.

SUBSTANCE: method involves chrome tanning and post-tanning a semi-finished product through chrome tanning in the presence of a product of reaction of 3-aminopropyltriethoxysilane and glycidylmethacrylate in molar ratio of 1:2 and consumption of the chrome tanning agent and reaction product of 3-4% and 2-3% of the weight of the semi-finished product respectively. Neutralisation and hydrophobisation with a polymer tanning agent are then carried out for 30-40 minutes with consumption of the tanning agent equal to 8-10% of the weight of the semi-finished product. After that dyeing is carried out in the presence of a synthetic tanning agent in amount of 3-4% of the weight of the semi-finished product. Post-tanning is carried out with a plant-material tanning agent and the semi-finished product is also treated for 20-30 minutes with a product of reacting hexamethylenediamine with phosphoric acid and urea in the presence of glycerin in molar ratio of 1:3:3:0.5 respectively, in amount of 3-4% of the weight of the semi-finished product and for 20-30 minutes with organic acid in amount of 0.5-1.0% of the weight of the semi-finished product. Further, the semi-finished product undergoes greasing and re-treated for 40-50 minutes with a product of reacting hexamethylenediamine with phosphoric acid and urea in the presence of glycerin in molar ratio of 1:3:3:0.5 and consumption of 7-8% of the weight of the semi-finished product, volume ratio of 0.8-1.0 and temperature of 20-22C. Hydrophobisation with a polymer tanning agent, dyeing in the presence of a synthetic tanning agent, post-tanning with a plant-material tanning agent, further treatment with a product of reacting hexamethylenediamine with phoshoric acid and urea in the presence of glycerin in the said molar ratio and with organic acid is carried out in one bath. Separation and drying are carried out after all operations.

EFFECT: higher water-, fungus- and heat-resistance of leather under high moisture and temperature conditions, and wide range of special types of leather.

2 cl, 3 tbl, 5 ex

FIELD: chemistry.

SUBSTANCE: method involves tanning a semi-finished product with a chrome tanning agent, neutralisation, washing, dyeing and tanning with organic tanning agents twice. The first tanning is carried out with a polymeric tanning agent, while the second is carried out with a mixture of synthetic and vegetable tanning agents. Hydrophobicising greasing, treatment with an organic acid and re-tanning with a chrome tanning agent are then carried out. Additional washing is carried out before neutralisation. Dyeing is carried out after the second tanning. Neutralisation, tanning twice and dyeing are carried out at water-to-goods ratio of 0.5-0.7. Hydrophobicising greasing is carried out in the presence of a 20% solution of the product of reacting amino alcohol with fatty acids of vegetable oils of the C12-C22 fraction and boric acid in molar ratio of 2:1:1 in mineral oil in amount of 0.5-1.5% of the weight of the semi-finished product.

EFFECT: good hygienic properties of hydrophobic leather and prolonged fungus resistance of the leather in high humidity and temperature conditions.

2 tbl, 5 ex

FIELD: leather industry.

SUBSTANCE: invention relates to leather industry in production of leather of various assortment, in particular, to methods of drumming leather in presence of fungicide, and can be used in skin processing for improving operational properties. Method of drumming leather is implemented with drumming composition in presence of an effective antifungal inhibitor, the latter is represented by 6.0 % solution of N1-chloro-methylbenzimidazole fungicide. Fungicide is dissolved in ethyl alcohol taken in the amount of 0.2-0.5 % of squeezed leather weight at the drumming composition consumption of 20-22 % of the squeezed leather weight in terms of 100 % fat. Drumming time is 1.5-2.5 hours at the temperature of 70-80 C.

EFFECT: proposed method of drumming leather provides effective antifungal inhibition at high quality of finished skin.

1 cl, 2 tbl, 3 ex

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