The processing method of the hide

 

(57) Abstract:

The method refers to the leather industry and can be used in making leather for various purposes. The method includes obessolivanie pickling ammonium sulfate in the amount of 0.3-0.8% by weight of the hide, in the presence of condensation products of formaldehyde and urea at a ratio of 2 : 1, additional obessolivanie at a flow rate of ammonium sulfate 2.0 to 2.5% by weight of the hide and the abating. The method improves the quality of skin and reduce the consumption of raw materials. table 1.

The invention relates to chemical treatment of the hide and can be used in the leather industry for the generation of skins of various assortment.

A method of processing of the hide, including his washing in the presence of phthalic anhydride in the amount of 0.2-0.3% by weight of the hide and obessolivanie ammonium sulfate at a flow rate of 1.25-1.75% of the weight of the hide /SU authorship, 1638166, A1, 30.03. 1991/.

The disadvantage of this method is that it does not allow you to get ready skin with high strength properties.

The closest analogue of the proposed technical solution is the method of processing of the hide, including his obessolivanie 1.5 to 2.5% hold, 1051127, A, 30.10.1983/.

The disadvantage of this method is that, despite the almost complete degree of obessolivanija of the hide, the use of phthalic acid leads to deposition on the surface of the hide protein substances and phthalates calcium, resulting in hard, otusiste skin. The decrease in pH of the processing liquid with the introduction of phthalic acid promotes the formation of hydrogen sulfide, which dramatically degrades the environment in the shops.

The technical result of the invention is to improve the quality of the skin and reducing consumption of raw materials the production of 100 m2skin.

This result is achieved by the fact that in the processing method of the hide, including his obessolivanie ammonium sulfate in the presence of organic compounds and the abating, obessolivanie produce at a flow rate of ammonium sulfate 0.3 to 0.8% by weight of the hide, as the organic compounds used, the condensation products of formaldehyde and urea at a ratio of 2:1, followed by additional obessolivanie at a flow rate of ammonium sulfate 2.0 to 2.5% by weight of the hide.

A distinctive feature of the proposed method is that use as organic with the in and reduce the consumption of raw materials due to the effect of structuring. Condensation products, penetrating in the front layer of the hide, are associated with functional groups of collagen and provide a solid connection between the front and middle layers of the dermis. Additional structuring is achieved by deposition of oligomeric products of condensation on the border of the papillary and reticular layers. Thus substantially reducing the detached skin and increased output of finished leather per mass of raw materials.

Condensation products of formaldehyde and urea at a ratio of 2:1 produced by the industry under the names Binder M-2 TU 6-06-0203398-388-90, Carbamoyl MT-2 TU 2484-120-057-4685-93, Carbamoyl TSEM THE 6-36-935-89.

The declared value of consumption of ammonium sulfate when obessolivanie pickling indicates the optimal processing conditions of the condensation products. So the use of ammonium sulfate less than 0.3% by weight of the hide is not possible to remove calcium from the surface layers of the hide and to ensure penetration of the condensation products in the area between reticular and papillary layers of the dermis.

Increased consumption of ammonium sulphate with more than 0.8% leads to a decrease in pH of the processing liquid, which has a negative effect on the reactivity of the products condens is the ammonium less than 2.0% not ensure a complete removal of calcium from the hide, resulting in tighter skin. Increased consumption of ammonium sulfate with additional obessolivanie more than 2.5% is not economically feasible and, in addition, reduces the efficiency of the enzymatic bating.

The method is as follows.

The hide, obtained by standard methods from the skins of cattle, after ashing obezbolivaet when J. K. 1,2-1,3 within 20 minutes of 0.3-0.8% of ammonium sulfate, then enter 0,3-0,5% of condensation products of formaldehyde and urea at a ratio of 2:1 and processing continues 45-50 minutes. Additional obessolivanie carried out at J. K. 1,2-1,3 fresh processing liquid at a flow rate of ammonium sulfate 2.0 to 2.5% by weight of the hide for 45-50 minutes. Then injected with 0.2-0.3% of the enzyme preparation by weight of the hide, and make the abating of the hide for 30 minutes. After washing the processes of pickling and tanning is carried out on the current methodology.

Example 1. The hide, obtained from the skins of cattle, under the current methodology, after ashing obezbolivaet within 20 minutes of ammonium sulfate in the amount of 0.3% by weight of the hide, when J. K. 1.3 and the temperature of the 28oC, then enter 0.3% Binder M-2 and continue processing 45 minutes. The fluid is drained and the weight of the hide, after 45 minutes introduce the enzyme preparation, it G-SX in the amount of 0.2% by weight of the hide and are abating within 30 minutes. The spent solution is drained. Rinsing, pickling, tanning, subsequent processes and operations performed by the current methodology.

Example 2. The hide, obtained from the skins of cattle on a standard method, after the ashing process, as in example 1, but obessolivanie produced in the presence of 0.4% Karamala MT-2, the consumption of ammonium sulfate when obessolivanie is 0.6%, and with additional obessolivanie of 2.3% by weight of the hide.

Example 3. The hide, obtained by standard methods from the skins of cattle, treated as in example 1, but obessolivanie produced in the presence of 0.5% Karamala TSEM at a flow rate of ammonium sulfate to 0.8%, with additional obessolivanie consumption of ammonium sulfate is 2.5% by weight of the hide.

Example 4. The hide, obtained by standard methods from the skins of cattle, treated as in example 1, but the consumption of ammonium sulfate when obessolivanie and additional obessolivanie is respectively 0.2% and 1.9% by weight of the hide and obessolivanie produced in the presence of 0.2% Binder M-2.

Example 5. The hide, ATA ammonium when obessolivanie and additional obessolivanie respectively 0.9% and 2.6% of the weight of the hide and obessolivanie produced in the presence of 0.6% Karamala MT-2.

Quality indicators received skin compared to skin on the prototype presented in the table.

The use of the proposed method will improve the quality of finished leather and significantly reduce the consumption of raw materials.

The processing method of the hide, including his obessolivanie ammonium sulfate in the presence of organic compounds and the abating, characterized in that obessolivanie produce at a flow rate of ammonium sulfate 0.3 to 0.8% by weight of the hide, as the organic compounds used, the condensation products of formaldehyde and urea at a ratio of 2 : 1, followed by additional obessolivanie at a flow rate of ammonium sulfate 2.0 to 2.5% by weight of the hide.

 

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2 tbl, 2 ex

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

1 tbl, 1 ex

FIELD: leather industry.

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2 tbl

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3 dwg, 4 tbl

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4 tbl, 4 ex

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2 cl, 1 tbl, 5 ex

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2 cl, 4 tbl, 6 ex

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2 cl, 1 tbl, 9 ex

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14 cl, 1 dwg, 4 ex

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4 tbl, 4 ex

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