Method of tanning hides

FIELD: chemistry, hide tanning.

SUBSTANCE: method relates to tanning hides and can be used in the leather industry. Animal hides are treated with a solution of chrome tanning agent with addition of an activating organic agent in form of aminocapronic acid at concentration of 8-12 g/l.

EFFECT: improved strength properties of hides and environmentally safe method.

5 ex

 

The invention relates to chemical treatment of skins, and is intended for tanning animal skins with the achievement of high-strength skin and increase of ecological safety of production.

A method of obtaining produbanco of semi-finished cattle using tanning solutions containing chromium tanning agent, neutralizing means and aliphatic carboxylic acids With4-C6with the addition polyethyleneglycolate sodium and sodium lignosulphonate [RF Patent №2031956, CL SS 3/06, 1995].

The disadvantages of the method include the inability to obtain skin with high strength properties, hit the wastewater toxic sulfonates.

There is a method of tanning skins with the use of tanning solution-based reaction products of Polyoxymethylene with a secondary amine and alcohol and was after the reaction in the form of tertiary amines and ether groups [U.S. Patent No. 4270912, CL SS 3/06, 1981].

This method of tanning the skin strength at the limit of acceptable (to 0.8 kgf/mm2), and the formation of tertiary amines leads to contamination of sewage toxic amines.

There is a method of tanning hides and skins (prototype) on the basis of chrome tanning agent to use as the activating polymeric agent is poly-2-oxypropylene chloride when the concentration is from 0.005 to 0.01 g/L. The introduction of this polymer agent accelerates the tanning process (Patent RF №2028384, CL SS 3/06, 1995).

The disadvantages of this method are the need for freshly prepared polymer agent, wash with acetone or isopropyl alcohol, which leads to pollution pairs of organic solvents, as well as insufficient sample strength at break (0,54-0,96 kg/mm2) when the elongation of 29-32%.

The technical result of the invention consists in using as an additive, intensify the tanning process and is conducive to a skin with the durability of the strap 1,27-1,66 kg/mm2when the elongation of 32-36,5%, allowing the use of leather for clothing, use of aminocaproic acid or gelatin at concentrations of 8-12 g/L. Given the low toxicity of reagents used and their nematocyst, increased environmental safety of production.

The invention consists in that in the method of tanning hides and skins by treating them with a solution of chrome tanning agent with sequential introduction of neutralizing and activating organic agents as organic agent used aminocaproic acid or gelatin, non-toxic substances, widely used in the production of chemical fibers, organic synthesis, pharmaceuticals, or in pexeva the industry, at a concentration of 8-12 g/l When using conventional neutralizing agents, for example sodium, the process of tanning ends in 6-10 hours from the receipt of the skin strength to 1.06 kg/mm2when the elongation of up to 36.5% at a thickness of 0.6-0,78 mm, which allows you to use the skin to make clothes and shoes.

In tanning solution with a content of chrome tanning agent 20-30 g/l with stirring introduced 8-12 g/l aminocaproic acid (or gelatin)in a rotating drum with Golem served half of a solution of a tanning agent, and after an hour of processing - the other half, with the usual tanning temperatures (26-32°C). After two hours from the beginning of the process was introduced neutralizing agent is a solution of soda, half of the total consumption of soda, after another hour the second half of the solution of a neutralizing agent. Tanning ends in 8 hours from start tanning at positive sample KIP. Then spent washing produbanco of the hide pulling and mechanical operations. The processes of tanning was carried out at liquid ratio of 0.6, the consumption of chrome tanning agent (in terms of Cr2O3) 1.5% of the weight of the hide. The original solution of soda, served in a tanning drum, has a concentration of 171 g/l At concentrations of aminocaproic acid or gelatin less than 8 g/l duration of the process increases, and at concentrations of more than 12 g/l indicators of quality is and the skin does not improve, which limits the feasibility of increasing the additive concentration.

A distinctive feature of the proposed method is that the introduction of aminocaproic acid or gelatin allows you to get the skin with high strength properties with significant elongation due to the formation of additional cross-links between functional groups of proteins and compounds resulting from the interaction of the complexes of chromium (III) with active groups aminocaproic acid or gelatin in the presence of neutralizing means.

Example 1. At the specified mode has probbaly the skin of a goat at a concentration of tanning agent 20 g/l and aminocaproic acid 8 g/l 8 hours tanned skin thickness was 0.6 mm at a tensile strength of 1.66 kg/mm2and the elongation of 32% against acceptable to 0.8 kgf/mm2.

Example 2. Tanning goat solution with a concentration of tanning agent 30 g/l and aminocaproic acid 12 g/l of the thickness of the skin was 0,78 mm at a tensile strength of 1.53 kgf/mm2and the lengthening of 34.5%.

Example 3. Tanning sheepskin tanning solution with a concentration of tanning agent 30 g/l of gelatin 8 g/l received a skin thickness of 0.65 mm at a tensile strength of 1.27 kgf/mm2and the lengthening of 36.5%.

Example 4. Tanning sheepskin tanning agent solution with a gelatin concentration of 12 g/l after 8 hours the resulting skin that is a woman of 0.65 mm at a tensile strength of 1.35 kg/mm 2and the lengthening of 32.5%.

Example 5. Tanning of raw rawhide light when the concentration of the tanning agent 30%, aminocaproic acid 10 g/l obtained skin thickness of 0.94 mm at a tensile strength of 1.32 kg/mm2and the elongation of 32%.

The thickness of the leather must be in the range of 0.6-1.2 mm, the strength of the strap in the gap is not less than 0.8 kgf/mm2when the elongation of 30-40%.

The method of tanning hides and skins by treating them with a solution of chrome tanning agent with the introduction of the activating organic agent, wherein as the organic agent used aminocaproic acid at a concentration of 8-12 g/L.



 

Same patents:

FIELD: leather industry.

SUBSTANCE: method involves pickling leather depilated hide with sodium chloride and sulfuric acid, addition of chrome tanning agent to the same bath in its consumption 0.5-0.6% of depilated hide mass as measured for chrome oxide, and chrome-plating is carried out for 2-4 h. Aliphatic dialdehyde is added to same bath in the concentration 3-6% of depilated hide mass, and treatment is carried out for 2-3 h wherein glyoxal or glutaraldehyde is used as dialdehyde. Invention provides enhancing thermal stability and strength properties of leather and can be used in tanning leathers for different designation and assortment.

EFFECT: improved tanning method.

2 cl, 1 tbl, 9 ex

FIELD: leather industry.

SUBSTANCE: method comprises pickling, tanning, and neutralizing the semifinished item. During pickling and subsequent tanning, the picking liquid is provided with acetate sodium in amount of 0.2-0.5 % and, then, chromic tanner in amount of 1.5-1.8%. The tanning is carried out until the pH of the solution reaches 4.2-4.4.

EFFECT: enhanced quality of tanning.

2 tbl

The invention relates to light industry and can be used in tanneries tanning leather

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The invention relates to the leather industry and can be used for the production of leather from the skins of fish for various, mostly fancy leather goods

The invention relates to light industry and can be used in chemical processing of sheepskin raw materials and fur raw materials

The invention relates to the processing of hides and skins of cattle and small cattle, which can be used for the production of leather for the uppers, and clothing and haberdashery

FIELD: leather industry.

SUBSTANCE: method comprises pickling, tanning, and neutralizing the semifinished item. During pickling and subsequent tanning, the picking liquid is provided with acetate sodium in amount of 0.2-0.5 % and, then, chromic tanner in amount of 1.5-1.8%. The tanning is carried out until the pH of the solution reaches 4.2-4.4.

EFFECT: enhanced quality of tanning.

2 tbl

FIELD: leather industry.

SUBSTANCE: method involves pickling leather depilated hide with sodium chloride and sulfuric acid, addition of chrome tanning agent to the same bath in its consumption 0.5-0.6% of depilated hide mass as measured for chrome oxide, and chrome-plating is carried out for 2-4 h. Aliphatic dialdehyde is added to same bath in the concentration 3-6% of depilated hide mass, and treatment is carried out for 2-3 h wherein glyoxal or glutaraldehyde is used as dialdehyde. Invention provides enhancing thermal stability and strength properties of leather and can be used in tanning leathers for different designation and assortment.

EFFECT: improved tanning method.

2 cl, 1 tbl, 9 ex

FIELD: chemistry, hide tanning.

SUBSTANCE: method relates to tanning hides and can be used in the leather industry. Animal hides are treated with a solution of chrome tanning agent with addition of an activating organic agent in form of aminocapronic acid at concentration of 8-12 g/l.

EFFECT: improved strength properties of hides and environmentally safe method.

5 ex

FIELD: process engineering, leather industry.

SUBSTANCE: after hide pickling, skins are sent to ageing. Then fur leather layer is processed by priming solution comprising chrome tanning agent with concentration of 9-18 g/l per chrome oxide. Skins are aged to effect main paste-tanning-stuffing and ageing.

EFFECT: improved organoleptic properties of fur skins, ie broach, softness, elasticity and higher tensile strength.

2 tbl, 3 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 20-22°C. 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: invention refers to general chemical engineering and is applicable to measure a mass transfer rate of various materials into capillary-porous bodies of leather and fur industries, wood processing, construction materials manufacturing, textile industry, etc. The method consists in the fact that capillary-porous body samples, e.g. leather, are filled with chemicals; this process involves sectioning specimens to be analysed to a chemical penetration speed as shown by a penetration depth per a unit of time. The capillary-porous bodies, e.g. thickness leather specimens are fixed in a retainer of a contrast colour, placed on a surface of a contrast colour and recorded by means of a remote digital camera fixed on a Tripod. The digital camera is provided with extension rings for macrophotography and a ring flash; a sample image is uploaded into a software programme for digital processing of colour images to generate a chemical penetration histogram into the thickness of the capillary-porous body, which is used to measure an area of the stained specimen, whereas a speed is calculated by the area of the stained specimen per a unit of time.

EFFECT: invention provides the more effective measurement of mass transfer speed in the capillary-porous bodies, and reducing the length of the process.

29 dwg, 6 tbl

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