A method of manufacturing colored leather

 

(57) Abstract:

Method for manufacturing colored leather-based basic salts deposition of chromium on the fibers of the dermis in the form of uncharged complexes, which do not prevent the penetration of anionic dyes during dyeing. The hide of cattle subjected to liming, pickling, tanning basic chromium salts planing, neutralization, dyeing and greasing and finish. Before pickling spend processing an aqueous solution of ammonium sulfate and urea resin. The latter is synthesized in alkaline environment of sodium carbonate, urotropine, urea and water. The reaction mass is brought to a boil and mix with the nonionic surface-active agent and before use, dilute with water 1 : 10. As the nonionic surfactants used neonol. The method allows to provide the necessary physico-chemical properties of the finished skin, eliminate otdelnosti, to reduce the flow of dye. 1 C.p. f-crystals, 2 tab.

The invention relates to the processing of hides and skins of small and large cattle, which can be used for the production of leather for Shoe uppers, garments and fancy goods.

From what Alenia substances, providing a paint over, uniformity, depth of color tone of finished leather (USSR Author's certificate N 1812254, CL 06 D R 3/32 published 25.12.1993,, bull. 16. Patent GDR N 238709, CL 06 D R 3/32, published. 1986 French Patent N 257615, published. 1986 , Methods of manufacture of chrome leather of different thicknesses for the uppers from the skins of cattle, MLP USSR, 1983).

These methods require a significant investment to achieve the goal by using excess dyes that during the dyeing is almost absorbed only by 50%.

In addition, the above methods do not guarantee a skin without tbsistuste.

A known method of manufacturing colored skin, which is the closest technical solution to the claimed method and provides, along with otlochno-ash processes, obessolivanie, pickling, tanning basic salts of chromium, planing, neutralization, dyeing, greasing and finishing processes (MLP USSR. Technology of production of chrome-tanned leather for Shoe uppers from large leather raw material, approved by the head of development for shoes, leather and leather goods industry Milligram USSR Bychowski E. C. June 23, 1988).

In this way the first prevents the penetration of the dye into the thickness of the dermis. Full paint over achieved significant excess dye (more than 4.5% by weight of shaved leather) and increasing duration of treatment.

The basis of the invention is tasked to develop a way to produce colored leather, which will provide the necessary physico-chemical properties of the finished leather, no tbsistuste, the reduction of the dye-providing a full paint over the skin.

The task in the way, which includes liming, pickling pickling, tanning basic salts of chromium, the gouging of the semi-finished product, neutralization, dyeing, greasing and finishing processes, in accordance with the invention is achieved in that before the pickling pickling treated with an aqueous solution of ammonium sulfate and mochevinoformaldegidny resin (ISF) in the ratio 1 : 1 at a flow rate past 0,1 - 0,35% by weight of the hide for 20 to 30 minutes, ISF synthesized in alkaline medium at a ratio of components, wt. including:

Water - 46,4 - 48,4

Sodium carbonate - 0,6 - 1,0

Methenamine - 21,6 - 23,6

Urea - 28,2 - 30,2

Then the reaction mass is brought to a boil, dispense a nonionic surfactant (for example, neonol) in the amount of 26.3 - 28.3% of the reaction mass,t the stitching papillary and reticular layers of the dermis, that eliminates the root cause of tbsistuste, promotes deposition on the fibers of the dermis uncharged chromium complexes, which, in turn, prevents the penetration of anionic dyes in thickness of the dermis during dyeing. In pogledovalnik processes consumption of dyes is 50% of the consumption of dyes by known methods.

Example. (Cost of materials % by weight of the hide).

100 kg of the hide after ashing and orezzoli before pickling process in the drum 20 to 30 minutes in an aqueous solution, which contains 0.2% of ammonium sulfate and 0.2% ISF, the spent solution is drained and conduct the process of pickling pickling, tanning basic salts of chromium, the gouging of the semi-finished product, neutralization, dyeing, greasing and finishing processes by known techniques. ISF is synthesized in alkaline medium at a ratio of reagents: water, with 47.4 g, sodium carbonate and 0.8 g methenamine and 22.6 g, urea - 29,2, the Reaction mass is brought to a boil and mix from 27.3 g of neonols and dilute with water to 1100 g of the solution.

In table.1 shows examples of the requested method.

In table.2 shows the parameters characterizing the process of dyeing anionic dark brown dye (TU 674-277-96 the th development of the dye and the complete absence ordasity leather found in examples 1 - 3 (within the claimed parameters) that provides full paint over skin. However, by reducing or increasing consumption of urea resin and the duration of the process, a decrease of dye testing and procras skin, as well as the emergence ordasity skin, which is unacceptable for soft skin.

From table. 1 and 2 also shows that skin made by examples 1 to 3 have high quality dyed leather, and examples 4 to 5 - figures are somewhat lower.

1. A method of manufacturing colored skin, including liming, pickling pickling, tanning basic salts of chromium, the gouging of the semi-finished product, neutralization, dyeing, greasing and finishing processes, characterized in that before pickling spend processing of the hide with an aqueous solution of ammonium sulfate and urea resin in a ratio of 1 : 1 at a flow rate past 0,1 - 0,35% by weight of the hide for 20 to 30 min, while urea resin synthesized in alkaline medium at a ratio of reagents, wt.h:

Water - 46,4 - 48,4

Sodium carbonate - 0,6 - 1,0

Methenamine - 21,6 - 23,6

Urea - 28,2 - 30,2

the reaction mass is brought to a boil and mix from 26.3 - 28.3% of the reaction mass, neionogennogo p. 1, characterized in that as a nonionic surface-active substances are used neonol.

 

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FIELD: fur industry, in particular, method for evaluating pickling quality of leather web in tanning of fur and sheepskin raw material.

SUBSTANCE: method involves providing testing on parallel groups of fur sheepskin after pickling on three topographic portions of sheep skin surface: skirt, spine and neck portions; processing samples of each group with acid-salt solution for 24 hours; withdrawing sheepskins of each group from acid-salt solution in predetermined time intervals; removing excessive liquid; placing said samples into tensile testing machine and stretching lengthwise of spine line by 40% relative to initial length thereof; holding samples in stretched state for 1 min and withdrawing from tensile-testing machine; leaving samples in free state for 10 min; determining residual elongation value in mm.

EFFECT: reduced time for determining quantitative pickling characteristic of skin web.

2 tbl, 2 ex

FIELD: fur industry, in particular, method for evaluating pickling quality of leather web in tanning of fur and sheepskin raw material.

SUBSTANCE: method involves determining quantitative pickling characteristic of leather web of semi-finished product by using time of solving thereof in alkaline solutions, said time depending on number and kind of intermolecular bindings destructed during pickling. Solving of collagen in alkaline solutions depends upon nature of preliminary acidic preparing procedure. Solving is provided in aqueous solution of potassium hydroxide having concentration of 150 g/l and temperature of 18-20 C. Derma solving time is found after preliminary thermal processing at temperature of 60-65 C during 1.5 hours. Method may be employed both in production of fur and sheepskin products and in fur processing.

EFFECT: wider operational capabilities and reduced time for determining quantitative pickling characteristic of skin web.

1 tbl, 1 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

FIELD: defatting of crude sheepskin-and-fur material.

SUBSTANCE: method involves treating crude material in bacterial suspension having lipolytic activity of 20-30 units/g and proteolytic activity of 2.5-3.5 units/g. Suspension contains product of total microorganism vital activity used in an amount of 4-8 g/dm3, synthetic surfactant used in an amount of 0.25-0.5 g/dm3, and prokaryotic crop of Pseudomonas sp. type used in an amount of 107-109 cells/cm3, water the balance. Treatment is conducted at temperature of 40±2 C during 45 min by providing mechanical actions, and liquid coefficient of 7-10.

EFFECT: improved quality of defatting sheepskins, improved elastoplastic properties and reduced level of toxic contamination of sewage water.

3 dwg, 4 tbl

FIELD: fur industry, in particular, process for pickling of sheepskin fur coats and raw fur material.

SUBSTANCE: method involves pickling fur sheepskins in solution such as sour-milk composition having titratable acidity of at least 300 T, lactic acid concentration of at least 25 g/dm3 and medium active reaction below 3.5; providing said process at temperature of 30±2 C during 16 hours at variable mechanical action, with liquid to acid ratio of 7, sodium chloride consumption of 20 g/dm3.

EFFECT: improved quality of fur sheepskins due to reduced curling of hair-covering and improved elastoplastic properties thereof.

4 tbl, 4 ex

FIELD: fur industry.

SUBSTANCE: invention is directed to processing fur sheepskin intended for manufacturing clothing, headgears, footwear parts and other fur items. Crude fur sheepskin of all preservation types is subjected to soaking, first degreasing, squeezing, haircutting, and fleshing according to known technology. Then fur sheepskin is subjected to additional processing in aqueous solution of sodium chloride (15-20 g/L) and nonionic surfactant composition (1-2 g.L) for 2-6 h at 30-32°C. After second degreasing and washing, pickle salting is carried out for 20-24 h. 4-6 hours after the beginning of pickle salting, processing solution is supplemented by 3-5 g composition of nonionic surfactants (1:1 mixture of Neonol AF 9-12 and syntamide 5). Finally tanning and greasing are performed.

EFFECT: improved performance characteristics fur sheepskin intermediate product.

2 cl, 1 tbl, 5 ex

FIELD: leather and fur industry.

SUBSTANCE: method envisages culturing of kefir fungal or kurungal ferment (obtained in amount 50%) on a nutrient medium, which medium is pasteurized skim milk for four first culturing days, pasteurized mixture composed of skim milk and fat-free curds whey on 6-14th days, and pasteurized fat-free curds whey on 15-18th days. Culturing is carried out for 18 days at 22±1°C and mechanical shaking twice a day for 15 min to give ferment with acidity 350-360°T. Ferment may be added to pasteurized cooled milk or to pasteurized curds whey in amounts 25% followed by fermentation at 22±1°C and acidity 350-360°T.

EFFECT: increased stability of ferment (double storage time), its acid-generating capability, and population autoregulation, increased activity to accumulate lactic acid by 2 1/2 times, and reduced restoration time by 4-6 h.

2 cl, 4 tbl, 6 ex

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: material processing.

SUBSTANCE: method provides degreasing and/or drying of animals' skins. According to method, skins, being subject to degreasing and/or drying, are brought in contact with one or more extractants. At least one dissolvent, selected from group consisting of dimethyl ether, methylal, dioxolane, diethyl ether and methyl ethyl ketone, is used as single dissolvent. Sheep, cows', goat's or pig's skins are subject to degreasing and drying. Process is carried out in stator or rotor reactor under pressure of 1-12 bar and at temperature between 5°C and 40°C.

EFFECT: improved efficiency of cleaning; improved ecological safety of process.

14 cl, 1 dwg, 4 ex

FIELD: chemistry.

SUBSTANCE: method involves degreasing sheepskin-fur raw material and can be used in fur production during degreasing of sheepskin-fur coat and fur raw material. Processing of the raw material is carried out in a degreasing bath containing a bacterial suspension, which has both lipolytic 50-60 units/gram and proteolytic 8-10 units/gram activity, with the total product of life activity of the microorganisms at a value of 5-6 g/dm3, synthetic surface-active substance - 0.5-1.0 g/dm3, catalase-positive procariotic culture of genus Erwinia sp. in the quantity 109-1010 cells/cm3 in the degreasing bath hydrogen peroxide is additionally added in the quantity 0.1-1.0 g/dm3, preliminarily dissolved in a tenfold amount of piped water. Processing is carried out at a temperature of 40±2°C, for 60 min., with some mechanical action from time to time and liquid crystallisation=10.

EFFECT: increase in quality of degreasing sheepskin and reduction in the level of toxic sewage production.

4 tbl, 4 ex

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