The way we produce tanned semi-finished "epicor-eco"

 

(57) Abstract:

The method can be used in making leather for various purposes. The hide, obtained by standard methods from the skins of cattle, after obessolivanija, bating and washing process carboxyethylgermanium the ethoxylates nonylphenols in the amount of 0.5 to 2.5% by weight of the hide, in the presence of 1-4% sodium chloride by weight of the hide. table 1.

The invention relates to chemical treatment of the hide and can be used in making leather for various purposes.

A known method of manufacture-dried semi-finished product, including the processing of the hide without preliminary pickling kalyanamitrata with a flow rate of 2-4% by weight of the hide at step increasing the pH of the solution with sodium carbonate treatment with an aqueous solution of formaldehyde with a flow rate of 2-4% when the pH of the processing liquid of 6.5-7.5 and the tanning solution of chrome tanning agent basicity 30-40% concentration 120-200 g/l [1].

The disadvantage of this method is the complexity of the process, involving multiple dosing of chemicals, in particular sodium carbonate to maintain the pH within the required limits. The use of formaldehyde

The prototype of the proposed technical solution is the way to develop tanned semi-finished "Epicor" includes treatment of the hide phosphate drug mixture medicaremedicaid within 1-2 hours at a flow rate of 1.0 to 3.0% by weight of the hide and the subsequent chrome tanning at a flow rate of chromium oxide of 1.5-2.0% by weight of the hide, [2].

The disadvantage of this method is that the phosphorus-containing chromium complexes formed by the interaction of the drug with a tanning agent, reducing the elastic properties of the skin and do not provide a soft supple leather with high values of elongation under tension.

In addition, the presence in the effluent of phosphorus compounds negatively affects the efficiency of sewage treatment plants.

The technical result of the invention is to improve the quality of the skin and reduction of pollution of wastewater tanneries.

This technical result is achieved in that in the method of manufacture tanned prefabricated, includes the processing of the hide, a water-soluble compound and chromium tanning, as water-soluble compounds are used karboksimetilirovaniya ethoxylates nonlinea feature of the proposed method is what use as water-soluble compounds karboksimetilirovaniya of ethoxylates nonylphenols can improve upregulations properties of the skin, because in the presence of sodium chloride, they are much faster penetrate into the structure of the dermis, screening functional groups of the protein in the first stage of tanning, which leads to an increase in the diffusion of chromium complexes. The presence of the drug carboxyl group contributes to the formation of labile complexes tanning material and provides a uniform distribution in the structure of the dermis, which is manifested in the increase in the elasticity of the finished leather. Used the product does not contain phosphates and provides high environmental performance of the process of tanning. The drug is chemically, hydrolytically and thermally stable, is characterized by mild dermatological effect, non-toxic, biodegradable. Available in industrial output in THE 2428-031-01511489-94 under the trademark "sinterol AFM".

Use sinterol AFM in the amount of less than 0.5% by weight of the hide is not possible to obtain the desired effect of intensification of the process of tanning, because at such expense and such processing remains a significant number of unshielded functional groups co">

With the introduction of the drug in the amount of more than 2.5% of the intensive foaming, which is unacceptable when processing in rotating equipment.

Reducing consumption of sodium chloride less than 1% does not have a positive effect on the diffusion of tanning with chromium compounds. In case of exceeding the content of sodium chloride of more than 4% decreases the effectiveness of screening action sinterol and changing the composition of the chromium complexes, which affects the heat resistance of the skin.

The method is as follows.

Solenoe the hide, obtained from the skins of cattle on a standard methodology, after obessolivanija, bating and washing process with W.to. 0.5 and a temperature of 25-27oC for 0.5-1.0 hours sinterol AFM in the presence of sodium chloride in amounts, respectively, 0.5 to 2.5% and 1-4% by weight of the hide. Tanning is carried out in the same solution tanning with chromium compounds basicity 33-42% at a flow rate of 1.5-2.0% for 8-10 hours increasing the basicity do not produce. The tanned prefabricated unload on aging. Further processes and operations carried out by standard methods.

Example 1. The hide, obtained from the skins of cattle on a standard methodology, after obessolivanija, me the P>C in the presence of 1% sodium chloride for 0.5 hours Then injected tanning compounds of chromium in the amount of 2% by weight of the hide, counting on the chromium oxide. After 9 h of the tanned prefabricated unload on aging. Subsequent processes are performed in accordance with the standard method of production of leather for the uppers.

Example 2. The hide, obtained by standard methods from raw cattle, treated as in example 1, but the flow sinterol AFM is 1.5% by weight of the hide, the consumption of sodium chloride and 2.5% W.to. 0.75, and the processing is done 45 minutes After chrome tanning and aging subsequent processes were performed according to standard methods of production of apparel of leather from raw cattle.

Example 3. The hide, obtained by standard methods from raw cattle, after the washing process of example 1, but the flow sinterol AFM is 2.5%, sodium chloride and 4% W.to. 1.0 and the treatment is carried out 1 h After chrome tanning and aging the subsequent processes are conducted in accordance with the standard method of production of haberdashery leathers.

Example 4. The hide, obtained by standard methods from the skins of cattle, after the washing process, as in example 1, but the flow sinterol AFM is 0.4%, sodium chloride 0.9 per cent,rupnagar cattle, after the washing process, as in example 1, the flow sinterol AFM was 2.6%, sodium chloride and 4.5%, W.to. 1.1 and processing are 1,1 h

Physico-mechanical parameters of the skin produced by the proposed method and the prototype presented in the table.

Thus, the processing of the hide on the proposed method using the drug sinterol AFM before tanning can improve the quality of the skin (to increase strength properties while maintaining a high softness and elasticity), to improve the distribution of chromium layers of the skin, eliminate pollution of waste water tanneries phosphorus-containing materials.

The way we produce dried semi-finished product, including the processing of the hide, a water-soluble compound and chromium tanning, characterized in that water-soluble compounds are used karboksimetilirovaniya ethoxylates nonylphenols in the amount of 0.5 to 2.5% by weight of the hide, in the presence of 1 - 4% sodium chloride by weight of the hide.

 

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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

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

3 dwg, 4 tbl

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