Method of drumming leather

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

 



 

Same patents:

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: 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: 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: 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: 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: 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: 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

The invention relates to the technology of black ink compositions on the basis of indoline and soot, which is an intermediate in the production of pigmented oiling compositions, and can be used in leather industry

The invention relates to light industry, particularly for leather and fur production
The invention relates to the leather industry, in particular to a method of treatment of skin obtained from raw materials of cattle intended for the manufacture of Shoe uppers, garments and leather goods

FIELD: chemistry.

SUBSTANCE: composition for the protection of materials against the action of water and/or a water solution, contains: a) organic solvent; b) reactionable bifunctional aminosiloxane, which has the general structural formula I: (I) R1-O[-Si(CH3)2O-]n[-Si(OR2)(R10)O-]mR3; c) fluoropolymer, which represents a polymer and/or a copolymer of monomers, which have the general structural formula (II)-(VI), with the following content of monomers counted per the total weight of the polymer and/or copolymer (wt %): (II) R4-O(CH2)2R6 4097, (III) R4-OR7 335, (IV) R4-OR8 025, (V) R4-NHCH2OH 015, (VI) CH2-C(R9)Cl 040, where: R1 and R3 independently on each other represent CH3-Si(OCH3)O-[-Si(CH3)(OR2)O-]x, or methyl, R2 represents an alkyl, which contains one, two, three or four carbon atoms, R4 represents a group CH2=C(R5)C(O)-, R5 represents H or methyl, R6 represents an alkyl, which contains, at least, 4 carbon atoms, substituted with one or two fluorine atoms, R7 represents a C1-C40 alkyl with a straight or branched chain, R8 represents hydroxy(C2-C4)alkyl, R9 represents H or C1, R10 represents -R11-NH-R11-NH2, R11 represents an alkylene, which contains two, four or five carbon atoms, x represents an integer number from 10 to 500, m represents an integer number from 1 to 50.

EFFECT: composition possesses high protective activity due to the combination of bifunctional polyogranosiloxanes and fluoropolymers in one means for leather protection.

12 cl, 2 dwg, 4 tbl, 3 ex

FIELD: chemistry.

SUBSTANCE: invention relates to solution of polyurethane-ureas for application of coating on substrates. Claimed solution can be obtained as a result of interaction of (a) mixture of two bifunctional polyetherdioles, each of which has molecular weight between 500 and 5000, with molar ratio of both components in the mixture being chosen between 10:90 and 90:10, (b) 0.7-1.5 mol of mixture of two lowmolecular bifunctional alcohols with molecular weight from 32 to 500 per a mole of polyetherdiol, as co-called chain-elongating agents, with molar ratio of both components in the mixture being chosen between 10:90 and 90:10, (c) 0.08-0.33 mol of aliphatic or cycloaliphatic bifunctional amine with molecular weight from 28 to 500 per a mole of polyetherdiol, as so-called chain-elongating element, (d) 1.8-2.9 mol of aromatic diisocyanate per a mole of polyetherdiol, and dissolution of obtained polyurethane-ureas or obtaining them in (e) 40-85 wt % of solvent or mixture of solvents calculated per the total mixture from (a)-(e), consisting of linear or cyclic esters and ketones, with residual NCO-groups being, possible interacted with monofunctional chain terminator. Also described is application of thereof for application on substrates, in particular textile products.

EFFECT: manufacturing stable covering solutions of polyurethane-ureas in toxicologically safe organic solvents, which have good elasticity, high strength and relatively high point of softening.

7 cl, 1 tbl, 11 ex

Leather // 2478120

FIELD: chemistry.

SUBSTANCE: leather, obtained by (1) pretreatment before tanning, (2) tanning process, (3) a process using a re-tanning agent which is a synthetic tanning substance and a resin. The re-tanning agent is used for re-tanning with subsequent dyeing and treatment by emulsion oiling using an emulsion oiling agent and (4) subsequent treatment after re-tanning.

EFFECT: invention enables to obtain leather having such characteristics as unique elasticity and softness in addition to providing a dressed coat, as well as the capacity for restoration, which prevents overstretching but enables to return to the initial state after use.

6 cl, 5 dwg, 3 tbl, 1 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: technological processes.

SUBSTANCE: method for dressing of leather semi-finished goods includes serial completion of preparatory and tanning processes, in which leather rawstock, especially from small breeds, for instance goat, prior to soaking process is exposed to low temperature unbalanced plasma of high frequency discharge for 420-600 seconds, with pressure of 30.1-39.9 Pa in discharge chamber, with flow of plasma-generating gas argon 0.06-0.08 g/sec, with current force at anode 0.5-0.8 A, with voltage of 3-5 kV at anode.

EFFECT: reduced time of rawstock treatment with increased value of boxcalf semi-finished product sealing temperature, being control index of tanning process.

1 dwg, 4 tbl

FIELD: chemistry.

SUBSTANCE: invention relates to technology of processing fur material and leather for giving the leather-fur semi-finished product water-repellant properties. The method for hydrophobisation of a leather-fur semi-finished product involves treatment with a fluorine-containing compound. The fluorine-containing compound used is 2,2,3,3,4,4,5,5,6,6,7,7,7-tridecafluoro-N-[3-(triethoxysilyl)propyl]-heptanamide in a solvent medium. The solvent is removed after treatment. The fluorine-containing compound is then fixed by ironing the hair coat of the semi-finished product or by treating the hair coat and/or leather material of the semi-finished product with hot air. The solvent used can be ethanol or supercritical carbon dioxide. If ethanol is used, treatment is done by dipping or spraying the surface of the hair coat and/or leather material of the semi-finished product with a solution of the water-repellent agent using a spray device. The leather-fur semi-finished product used is wool sheepskin.

EFFECT: leather-fur semi-finished product hydrophobisated in accordance with the invention provides good hygienic properties, has water-repellent properties characterised by limiting wetting angle, hygroscopicity, water absorption, moisture-retention capacity and moisture absorption; the hair coat of the hydrophobisated semi-finished product has a pleasant silky texture, and the leather material of the semi-finished product has a soft feel.

21 cl, 9 dwg, 1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: modified leather is meant for making internal components of shoes with good biocidal properties and relates to light industry. The modified leather includes a collagenic base with a multilayer structure, tanning, retan, oiling compounds and a biocidal additive, the later being in form of silver nanoparticles and alkyldimethylbenzyl ammonium chloride in ratio of 1-:-0-1.5 respectively. Content of silver nanoparticles is 710-5 - 6.410-3 wt %.

EFFECT: wide range of lining leather while cutting on number of biocidal agents used on the leather and stabilisation of deformation-strength characteristics of the leather during its use, as well as improved environmental friendliness of the process of manufacturing said leather.

2 tbl

FIELD: individual and household supplies.

SUBSTANCE: processing method for natural leather uppers after stretching and lasting operations involves high-frequency low-temperature unbalanced plasma effect in vacuum chamber with plasma generation air flow rate of 0.04-0.06 g/second for 180-280 seconds at 13-26 Pa pressure with discharge power of 0.7-2.0 kW.

EFFECT: enhanced shoe shape stability and adhesion durability in the wearing process.

1 dwg, 1 tbl

FIELD: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to copolymers consisting of monomers comprising acid groups with double bond and other hydrophobic monomeric component used in prophylaxis of inorganic and organic deposits in water-bearing systems. Invention describes a water-soluble copolymer comprising: (a) monoethylene-unsaturated monomers chosen from group consisting of monocarboxylic acids, dicarboxylic acids and sulfoacids that can be neutralized; (b) at least copolymerizable hydrophobic acrylic, monocyclic and/or bicyclic terpene comprising unsaturated double bond wherein terpene hydrocarbon is preferable, and copolymer is prepared by free-radical copolymerization of components (a) and (b) in an aqueous phase. Also, invention describes a method for synthesis of abovementioned copolymer and methods for its using. Invention provides synthesis of nontoxic copolymer used for prevention of deposits in water-bearing systems that can be easily prepared from available components and able to store for a long time without loss of activity.

EFFECT: improved preparing method, valuable properties of copolymers.

22 cl, 6 tbl, 6 ex

FIELD: leather industry.

SUBSTANCE: method, which is suitable for finishing chrome leathers, comprises consecutively applying coating layers followed by action with low-temperature plasma at generator lamp anodic current intensity 0.2-0.6 A. Action of low-temperature plasma is effected for 180-240 sec at pressure 13.3-26.6 Pa in discharge chamber and consumption of plasma-forming gas (argon) 0.035-0.04 g/sec. Method is implemented on high-frequency plasma installation.

EFFECT: increased adhesion of coating to dry and wet leather, dye penetration depth, resistance to repetitive bends, and strength at better quality of leather.

FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

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