The way we produce leather

 

(57) Abstract:

Usage: when designing skins of various assortments. The inventive treatment of skin chromiferous protein hydrolysate in the presence of amino compounds within 1-2 h after chrome tanning at a flow rate of protein and amino compounds, respectively, of 3.5 to 10.0% by weight of shaved leather, counting on the dry matter, and 1.5 to 4.0% by weight of shaved leather. Processing cross-linking agent within 1-2 h in the amount of 1-4% by weight of shaved leather. table 1.

The invention relates to chemical treatment chrome-plated semi-finished and can be used in the leather industry for the generation of skins of various assortment.

There is a method of generation of leather, including two-phase chromium tanning, retanning filling synthetic tanning agent based on dicyandiamide resin-modified product of the hydrolysis of leather shavings, J. K. 1.5 to 2.0, the temperature of 60-65oC for 1.0 to 1.5 hours and the consumption of tanning agent 3-4% by weight of shaved leather with subsequent neutralization, dyeing and greasing /1/.

The disadvantage of this method is the heterogeneity of the properties of the skin layers, which is due to surface linking the execution of the main tanning in 2 phases, intensive neutralization with increased consumption of sodium bicarbonate.

The prototype of the proposed technical solution is the way to making skins, including chrome tanning, processing synthetic tanning agent based on the chrome-containing protein hydrolysate and naphthalenesulfonate at the rate of 5% by weight of shaved leather, the temperature of 38-40oC, J. K. 1, for 20 min followed by the introduction of 3% acrylate the protein-resin and 0.5% mimotope extract /2/.

The disadvantage of this method is the relatively high rigidity of the obtained leather and their low elastic-plastic properties, due to low filling capacity of the tanning agent is a protein only 10-18% in Addition, the process of obtaining synthetic tanning agent is quite complicated and requires the use of high temperature-120-125oC and a pressure of 1.8-2.5 ATM. Synthesis of tanning agent are within 2-8 hours

The objective of the invention is to improve the quality of skin by improving their elastic-plastic properties.

The problem is solved in that in the method of manufacture of leathers, including chrome tanning, processing chromiferous protein hydrolysate and the subsequent processing of cross-linking agent is x consumption respectively of 3.5 to 10.0% by weight of shaved leather, counting on the dry matter, and 1.5 to 4.0% by weight of shaved leather, and handling cross-linking agent is carried out for 1-2 hours in the amount of 1-4% by weight of shaved leather.

Chromiferous protein hydrolysate get by acid hydrolysis of chrome shavings when heated to a temperature of 60-90oC for 3-4 h with constant stirring. The hydrolysate is a liquid, dark-green, containing 40-50% of dry matter, protein content of 30-40% 0.5-1% chromium oxide, pH 2-3.

A distinctive feature of the proposed method is that the processing of chrome-plated semi-finished chrome-containing protein hydrolysate in the presence of amino compounds with subsequent introduction of a cross-linking agent at the declared parameters of the process allows the specified monomer a product with negligible molecular weight, fuller and deeper understanding of the structure of the dermis, it evenly spread. Moreover, the reaction of condensation between them takes place directly on the fibers of the skin with the formation of cocondensates protein-protein and protein-aminosidine, which significantly increases the number of reactive functional groups that are centres of fixing dyes, oiling ELA, fats and filling material 30%

The introduction of chrome protein hydrolysate and amino compounds in amounts, respectively, below 3.0% and 1.5% as well as processing them less than 1 hour is not possible to obtain uniformly filled in all topographical areas with a high elastic-plastic properties. Introduction more than 10% and 4.0% as well as processing them for more than 2 h to increase the stiffness of the leather and chemical waste materials.

Processing cross-linking agent in a quantity less than 1% less than 1 h leads to a decrease of the filling ability of the hydrolyzate and doublelayer effect of the agent. Processing them in a quantity of more than 4% over 2 h results in hard leather.

The technology of the method is as follows.

Chrome semi-finished product obtained from the skins of cattle by standard methods, after washing, is treated with a solution of chromium protein hydrolysate in the presence of amino compounds at their expense, respectively, 3.5 to 10% by weight of sliced cake mix, counting on the dry matter, and 1.5 to 4.0% by weight of shaved leather with J. K. 1.0 to 1.2 and a temperature of 25-28oC for 1-2 h, after which the processing solution is injected structuring aithout, color, it is greased and finish by standard methods.

Example 1. The semi-finished product obtained by standard methods from byczyna heavy, after chrome tanning and washing process with J. K. 1.0 and a temperature of 25oC chromiferous protein compound in the amount of 3.5% by weight of semi-finished product, counting on dry residue, in the presence of 1.5% urea for 1 h, after which the processing solution is injected cross-linking agent formaldehyde in quantities of 1% by weight of the semifinished product and the treatment continued for 1 hour. Further processes and operations carried out by standard methods of generation of leather, chrome tanned for Shoe uppers.

Example 2. The semi-finished product of rawhide average process as in example 1, but the flow of chromiferous hydrolysate is 6.8% counting on the dry matter, and melamine 2,8% by weight of the semifinished product and the treatment is carried out for 1.5 hours Consumption urotropine is 2.5% and the treatment continued for 1.5 h

Example 3. The semi-finished product of rawhide easy process as in example 1, but the flow of chromiferous protein hydrolysate is 10% counting on dry residue and consumption of dicyandiamide 4% by weight of the semifinished product and the treatment is carried out for 2 hours Consumption glyoxal composition is ovci easy process, as in example 1, but the flow of chromiferous protein hydrolysate is 3% and the consumption of melamine 1% and the treatment is carried out for 45 min. Flow rate of + 0.8% and the treatment is carried out for 45 minutes

Example 5. Prefabricated from heavy bull is treated as in example 1, but the flow prosteradlo protein hydrolysate is 10.5% and the consumption of urea and 4.5% by weight of the semifinished product and the treatment is carried out for 2.5 h, the consumption of formaldehyde is 4.5% and the treatment continued for 2.5 hours

Qualitative indicators of finished leather obtained according to examples 1-5 and the prototype shown in the table.

Using the proposed method allows to get the leather for the uppers with a high elastic-plastic properties.

The way we produce leather, which includes chromium tanning, processing chromiferous protein hydrolysate and the subsequent processing of cross-linking agent, characterized in that the processing of chrome-containing protein hydrolysate is carried out in the presence of amino compounds for 1 2 h at their expense, respectively 3,5 10,0% by weight of shaved leather, counting on the dry matter, and 1.5 to 4.0% by weight of shaved leather, and the processing of cross-linking agent is carried out for 1 2

 

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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.

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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 20-22C. 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: 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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