Method for the production of leather for shoe upper

 

(57) Abstract:

The invention: the hide after peroxide-alkaline dehairing washed, treated with ammonium sulfate, sodium sulfite, potassium dichromate or sodium when their costs accordingly 1 - 2%, 2 - 4%, 0,7 - 1,0% by weight of the hide and sulfuric acid in the amount of 2.0 - 2.5%. For obrabotki use exhaust obezbolivaiuscii solution and the wash liquid. After spinning, doubling and planing conduct subsequent tanning with chromium compounds basicity 37 to 42% when the flow rate of 1.7 - 1.8%, and counting on the chromium oxide. 3 table.

The invention relates to light industry, in particular to leather manufacture, and can be used in the production of leather for the uppers.

Known double-bath method for the production of leathers, which is consistent processing of the hide chromium and recovery solutions [1] and its modification [2] where as tanning compounds are used dichromate potassium or sodium and chromium tanning agent basicity 37-42%

The disadvantages of these methods are a great length and complexity, the impossibility of complete recycling of chromium waste and high content with what obreteniyu is a method for the production of leather for Shoe upper, based on a combination of left lying and tanning processes [3] the Possibility of combining processes caused by conduction at the stage of preparatory processes peroxide-alkaline processing of raw hides. Left lying and tanning processes are carried out on waste solutions after dehairing and cleaning of the hide from which removed, precipitated with sulfuric acid protein products. Tanning is carried out on the spent pickle using tanning with chromium compounds basicity 37-42% To achieve the required temperature welding entered alkaline components. The tanning is subjected to not split the hide, which increases the amount of raw waste.

The aim of the invention is to intensify the treatment, reduction of water consumption and tanning agent, the possibility of more complete utilization of tannery wastes.

This is achieved by the fact that the hide, obtained by the method of peroxide-alkaline dehairing, the first stage is processed dehydrating salts and potassium dichromate or sodium, and then with sulfuric acid. At this stage used exhaust obezbolivaiuscii solution and rinsing liquid, from which oedaleus prefabricated, having a temperature welding 75aboutWith, unload, do the spinning, doubling, planing and conducting the second stage of tanning using tanning with chromium compounds basicity 37-42% of the cost of materials is reduced due to the re-use of tanning solutions first and second stage (up to 5 times use solutions of the first stage and 10 times the solutions of the second stage). The front and botermans saw in the second stage of the tanning processed separately, the consumption of the tanning agent to generate batamaloo Spilka is reduced to 1.5% by weight of a thickness of the semi-finished product in accordance with the standards of GOST. Eliminates the need to increase the basicity of the tanning agent in the second stage of tanning, because the basicity is adjusted in the process due to the different pH values of the external and internal layers of the dermis. The amount of chromium oxide in spillway trimmings and shavings reduced. The duration of the second stage of tanning is reduced due to the smaller thickness of the semi-finished product. The second stage of tanning can be done in the same equipment as dyeing and greasing processes, eliminates the need for retanning chrome tanning agent. The processing parameters are given in table.1.

Processing osushestvlyae-alkaline treatment in accordance with the technology of the prototype, and then pregabalina-tanning processes in accordance with the table.1. In dyeing and greasing processes excluded retanning chrome salts, other processes and operations have no differences from standard techniques.

In table.2 shows different ways of processing semi-finished product. In table.3 presents the characteristics of solutions and bulk.

Lower consumption of ammonium sulphate used for dehydration of the hide, it is necessary to increase the consumption of sulfuric acid to neutralize. In this case, the acidity of the hide is increased, therefore increasing the duration of the processes and the consumption of sodium sulfite to increase the basicity of tanning with chromium compounds in the second stage of tanning. In optimal ways of achieving the necessary acidity pickling in stage I, tanning eliminates the introduction of additional quantities of the alkaline component (sodium sulfite) at the final stage of tanning that can have a positive effect on the quality of the skin, as it reduces the possibility of ties the front layer. When the flow rate increases the drying salt more than 2% by weight of the hide is significant dehydration of the hide, which reduces the quality of the finished skin (the skin is toitaly of the hide and the simultaneous recovery of potassium dichromate in tanning compounds chromium (III). The inner layers of the dermis does not absorb the required amount of acid, the structure does not acquire sufficient separation of the fibers, a surface deposition of the tanning agent sabb.

When you reduce the amount of potassium dichromate in stage I tanned temperature welding material (less than 70about(C) is insufficient for carrying out mechanical operations ghosting and planing (not necessary elasticity of the dermis, there is a danger of thermodenaturation collagen), increased consumption of dichromate results in increased content of chromium in chromium waste (Spilka, chips), requires a greater amount of sodium sulfite recovery, and hence increase the total consumption of the specified salt. Reduction of dichromate in the first stage requires increasing the overall consumption tanning; while maintaining the optimum number of tanning with chromium compounds basicity 37-42% temperature welding less than 100aboutWith skin neprodumani (example 7).

Increased dosage tanning with chromium compounds in the second stage of tanning contributes less to the development of the tanning agent, in waste solutions contain large amounts of chromium. When low flow occurs, Narodov none the box is used as dehydrating salts, reagent for the recovery of potassium dichromate or sodium and increase the basicity of tanning with chromium compounds. The reduction in the number slows down the process, restoring dichromate is not fully, there is Narodov. When a large flow rate specified salt on the material occurs plate front surface, hampered the ability to reuse solutions.

The proposed method for the production of leather for the uppers, to reduce water consumption, as all left lying processes and the first stage of tanning are carried out on the spent solution after peroxide-alkaline dehairing. The second stage of the tanning is carried out in fresh water, but its consumption is reduced, since the mass of the material after ghosting and planing reduced twice in comparison with Golem. In addition, for tanning batamaloo Spilka a lower consumption of chromium (up to 1.5%), as in accordance with the normative-technical documentation, the content of chromium oxide in it not less than 3.5% (instead of 4.3% for the front Spilka). Installed reusability of solutions of the second stage of tanning (at least 10 times), skin quality will not be degraded and the flow of water, hemmati Evesham 7-8 h, to increase performance.

Thus, the proposed method is compared with the prototype allows you to get the leather for the uppers in a shorter time, reduce the amount of water consumption, tanning material, to improve the utilization of tannery waste, to reuse proven solutions.

Method for the PRODUCTION of LEATHER FOR SHOE UPPER, including the washing of the hide after peroxide-alkaline dehairing, tanning on the liquid obtained from spent obespechivayuschego solution and water washing, spinning, doubling, planing semi-finished product and then tanning with chromium compounds (III) basicity 37 42% characterized in that the tanning carried out by treatment with ammonium sulfate, sodium sulfite, potassium dichromate or sodium when their costs respectively, 1 2, 2 4, of 0.7 to 1.0% by weight of the hide and sulfuric acid in the amount of 2.0 to 2.5% and the subsequent tanning with chromium compounds is carried out at their expense 1,7 1,8% counting on the chromium oxide.

 

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The invention relates to a method of chemical treatment of skins, in particular to the pickling and tanning with chromium compounds, and can be used in the production of leather from batamaloo Spilka

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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

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EFFECT: improved tanning method.

2 cl, 1 tbl, 9 ex

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

5 ex

FIELD: process engineering, leather industry.

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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.

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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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