The method of soaking of raw hides

 

(57) Abstract:

The method refers to the leather industry and can be used in otlochno-ash manufacturing processes leathers from various raw materials. The method includes the processing of raw hides with an aqueous solution containing a surfactant, a hydrophobic organic solvent and water at a given mixing ratio, liquid ratio of 1.0 to 2.5 and the solution flow rate of 0.5 to 2.5% by weight of raw materials. The technical result is to simplify the method and reduction of pollution of wastewater. table 1.

The invention relates to the leather industry and can be used in otlochno-ash manufacturing processes leathers from various raw materials.

There is a method of soaking the leather raw material by processing it in an aqueous solution of sulfite or hydrosulfite sodium in the presence of wetting OP 10 [SU 146429, CL 14 WITH 1/04, BI No. 8, 1962].

The disadvantage of this method is poor degreasing of raw materials, often resulting when tagged the front surface of the skin.

The closest analogue of the proposed technical solution is the method of soaking raw material by processing it with W.to. 0.3 to 0.8 in an aqueous solution of surface-active washes, hydrophoby organic solvent else [SU, 834130, CL 14 With 1/04, 30.05.81].

The disadvantage of this method is the need for preliminary preparation of an emulsion of a surfactant in an organic solvent is carried out in two stages, as well as a significant consumption of organic solvent, resulting in the contamination of wastewater tanneries.

The technical result of the invention is to simplify the method and reduction of pollution of wastewater tannery.

This result is achieved in that in the method of soaking the leather raw materials by processing in an aqueous solution of a surfactant and a hydrophobic organic solvent treatment is conducted at a liquid rate of 1.0 to 2.5 in the following ratio of the components of the solution, wt.%:

Surfactant 20,0-30,0

Organic solvent 2,5-10,0

Water the Rest

when the flow rate of 0.5 to 2.5% by weight of raw materials.

A distinctive feature of the proposed method is that the conduct of soaking, combined with degreasing of raw materials, with W.to. 1,0-2,5 specified composition at a flow rate of 0.5 to 2.5% by weight of the raw material makes it possible to achieve a high degree - 1,0-2,5 enables uniformly supplied skins on all topographical areas without fear of damaging the front surface. The stated ratio of organic solvent and surfactant in aqueous solution provides the dispersion and emulsification of natural fat from the formation of stable emulsions that warns when tagged skins.

When conducting soaking in W.to. below 1.0 is not reached sufficient watering skins that are ready skin leads to reduced strength and elasticity. The conduct of soaking with W.to. over 2.5 at a flow rate of less than 0.5% by weight of the raw material does not allows to carry out the degreasing of skins. The conduct of soaking at a flow rate of higher than 2.5% is impractical because further enhance the effect of degreasing is not happening.

With the introduction of surfactant is less than 20 wt.% and the organic solvent is less than 2.5 wt.% the degreasing process is not completely, and the skin remains a large amount of natural fat.

The introduction of surfactant in the amount of more than 30 wt.% and an organic solvent is more than 10 wt.%, does not allow to obtain stable organo-aqueous solution, and the excess organic solvent affects the environment of production.

The technology of the method is as follows.

Prepare an aqueous solution for soaking, which is eh. Then with careful stirring the resulting mixture was gradually add water. Thus prepared composition are: soaking off the washed raw cattle, swine or sheepskin with W.to. 1.0 to 2.5 and a temperature of 32-35C during the 4.5 to 5.0 hours. The flow rate of from 0.5 to 2.5% by weight of raw materials.

Further processes and operations are carried out by known techniques (see table).

Example 1. A: soaking off and chemical degreasing pre-washed raw cattle macromolecule method of canning is carried out at W.to. 1 and a temperature of 35C for 4.5 hours composition containing, in wt.%:

Neonol 20

Turpentine 2,5

Water 77,5

at the rate of 0.5% by weight of raw materials.

Further processes and operations are by the method of production of leather for the uppers natural outer surface.

Example 2. A: soaking off and chemical degreasing pre-washed raw pork macromolecule method of canning is carried out at W.to. 1,75, the temperature of 35C for 4.5 hours composition containing, in wt.%:

Previal 25,0

White spirit 5,0

Water 70,0

at a flow rate of 1.5% by weight of raw materials.

Further, the processes and operations performed by the method of production is itogo raw sheepskin macromolecule method of canning is carried out at W.to. 2.5 and a temperature of 35C for 4.5 hours composition containing, in wt.%:

OP-10 30,0

Spun oil 10,0

Water 60,0

at a flow rate of 2.5% by weight of raw materials.

Further processes and operations carried out by the method of production of leather for the uppers.

Example 4. A: soaking off and chemical degreasing pre-washed raw cattle macromolecule method of canning is carried out at W.to. 0.5 and a temperature of 35C for 4.5 hours composition containing, in wt.%:

Neonol 18,0

Turpentine 2,3

Water 79,7

at a flow rate of 0.4% by weight of raw materials.

Further processes and operations are by the method of production of leather for the uppers natural outer surface.

Example 5. A: soaking off and chemical degreasing pre-washed raw pork macromolecule method of canning is carried out at W.to. 3.0 and a temperature of 35C for 4.5 hours composition containing, in wt.%:

Previal 32,0

White spirit to 12.0

Water 56,0

at a flow rate of 2.7% by weight of raw materials.

Further processes and operations are by the method of manufacturing elastic leathers for the uppers.

Use predlojennaya skin with high performance properties of various raw materials.

The method of soaking the leather raw materials by processing in an aqueous solution of a surfactant and a hydrophobic organic solvent, characterized in that the processing is carried out at a liquid rate of 1.0 to 2.5 in the following ratio of the components of the solution, wt.%:

Surfactant 20,0-30,0

Organic solvent 2,5-10,0

Water the Rest

when the flow rate of 0.5 to 2.5% by weight of raw materials.

 

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SUBSTANCE: fur fells are treated with aqueous solution of nonionic surfactant and antiseptic, which is aqueous dispersion of acrylic copolymer with dimethylformamide at ratio (1.0-1.1):(5.0-5.1), respectively.

EFFECT: improved physico-mechanical characteristics of fur fells and improved environmental condition.

1 tbl, 2 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: textile industry.

SUBSTANCE: method involves water intrusion and boiling of samples of leather fabric. During water intrusion the increase in thickness of leather fabric samples is determined by boiling. Leather fabric samples are measured during water intrusion by means of thickness gauge before boiling and after boiling. Thickness increase of samples is calculated in percents. If thickness of samples increases by more than 50%, leather fabric is subject to mechanical treatment, and namely to scouring.

EFFECT: invention allows determining thickness increase of leather fabric in percents at boiling and based on this the water content which is enough to perform scouring.

3 ex, 1 dwg

FIELD: process engineering.

SUBSTANCE: proposed method comprises raw stock soaking, washing, shearing, fleshing, deoiling by water solution in the presence of anionic surfactant at 42°C, "ЖК" 7, pickling and tanning-oiling by water composition containing sodium chloride, chromium tanning agent and fat emulsion. Proposed composition comprises additionally the mix of nonionic surfactant and chloride alkyl dimethyl benzene ammonium at the ratio of 60-70:30-40 in amount of 0.5-1.0 g/l. Note here that processing is performed for 70-90 min. Composition for tanning-oiling comprises the mix of nonionic surfactant and isopropanol at the ratio of 90:10 in amount of 0.5-1.5 g/l while oiling agent ''Talis'' is used in amount of 4-5 g/l.

EFFECT: higher operating properties.

1 tbl, 4 ex

FIELD: chemistry.

SUBSTANCE: method of treating leather material, which involves successive two-step soaking with a surfactant-based composition, liming, deliming, softening, pickling and tanning, wherein at the first soaking step, at the second soaking step, as well as at the liming step, the composition used contains surfactants in form of a product of condensation of float tar with triethanolamine, taken in molar ratio (0.8-1.2):1.0, sodium alkylbenzene sulphonate and neonol with average degree oxyethylation 12, water and isopropyl alcohol, also employs sodium carbonate, sodium sulphide and calcium hydroxide depending on the step. All components are taken in a defined ratio.

EFFECT: invention improves quality of material, reduces concentration of toxic sulphides in waste water, enables to use domestically produced chemicals, including oleic acid production wastes, thereby reducing the cost of the process of treating leather material.

2 tbl, 3 ex

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EFFECT: method provides prolonged storage of fur semi-finished product in medium of contaminated by microorganisms and mold, and use of silver and copper citrate during dressing has decontamination action on waste water, which improves environmental safety of process.

1 cl, 4 tbl

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