Method of manufacturing lining leathers from pig rawstock

FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

 

The invention relates to the leather industry and can be used in the production of lining leather from raw pork.

A known way of generating split leather lining leather of swine raw material including degreasing, retanning chrome tanning agent, neutralization, retanning organic tanning agent, processing dispenser, combined dyeing and greasing with the consumption of fat 8-9% by weight Spilka and additional greasing with the consumption of fat 3-4% for 30-40 min (SU 1794092 A3, class 14 With 13/00, 07.02.93).

The disadvantage of this method is that it is not possible to obtain a uniformly colored lining leather with high fastness to dry and wet friction.

The closest analogue of the proposed technical solution is the way we produce leather lining pork raw material including degreasing semi-finished product, neutralization, treatment with dispersant NF, dyeing and greasing, combined with filling (Handbook Tanner (Technology) edited Nagpalabas, M., Legprombytizdat, 1986, p.88-94).

The disadvantage of this method is that it does not allow lining leather, black, high strength and high color fastness to dry and wet friction.

The technical result of the invention is to increase the exposure is oitation properties lining leather from raw pork.

This result is achieved in that in the method of manufacture of lining leather of swine raw material including degreasing semi-finished product, neutralization, dyeing and greasing, dyeing produced in two stages with intermediate rinsing the anionic dye black when its consumption at each stage of 0.5-0.6% by weight of cement, and after fatliquoring additionally carry out retanning chrome tanning agent in an amount of 0.6 to 1.0% by weight of semi-finished product, counting on the chromium oxide, and processing of spun oil in the quantity of 0.8-1.0% by weight of the semifinished product.

A distinctive feature of the proposed method is that carrying out dyeing in two stages anionic dye black, as well as the fixing of the dye and fat in the dermis chrome tanning agent with subsequent processing of spun oil allows you to get the lining skin deep, black, high strength properties and high resistance to perspiration, dry and wet friction.

The technology of the method is as follows:

Prefabricated lining leather obtained according to the method of production of leather for the uppers and lining of pork raw material is washed at a temperature of 40°, degrease nonionic surfactants, again washed and subjected to neutralization in an aqueous solution of sodium bicarbonate. After washing at a temperature of 35°the produce of the first stage of the dyeing at a temperature of 50° With the anionic dye black in the amount of 0.5 to 0.6% by weight of semi-finished product within 20-25 minutes After washing at a temperature of 40°To conduct the second stage of the dyeing anionic dye black when the flow rate of 0.5 to 0.6% for 20-25 minutes Then skin it is greased with the consumption of fat 10-12% by weight of semi-finished product, counting for 100%fat, for 40-45 minutes, then in the same tub fall asleep chrome tanning agent in an amount of 0.6 to 1.0% by weight of semi-finished product, counting on the chromium oxide, and 30-35 min add spun oil in the amount of 0.8-1.0% by weight of semi-finished and continue processing for another 20-25 minutes Further processes and operations carried out by known techniques.

Example 1. Prefabricated lining leathers obtained by known techniques from pork raw, washed, degreased, again washed, neutralized and after washing is subjected to the first stage of dyeing anionic dye black at the rate of 0.5% by weight of semi-finished product at a temperature of 50° within 20 minutes After washing at a temperature of 40° produce a second stage dyeing anionic dye black at a flow rate of 0.6% by weight of semi-finished product at a temperature of 50° within 20 minutes Then in the same tub spend greasing, retanning chrome tanning agent in an amount of 0.6% by weight of semi-finished for 30 min and the processing of spun oil in the amount of 1.0% by weight of the floor is of apicata for 20 minutes Further processes and operations carried out by known techniques.

Example 2. Prefabricated lining leathers obtained by known techniques from pork raw materials, processed as in example 1, but the first and second stages of dyeing is carried out at a flow rate of anionic dye black to 0.55% by weight of cement, the retanning chrome tanning agent is produced when the flow rate is 0.8%, and the processing of spun butter is carried out at a flow rate of 0.9% by weight of the semifinished product.

Example 3. Prefabricated lining leathers obtained by known techniques from pork raw materials, processed as in example 1, but the first stage of the dyeing is carried out at a flow rate of anionic dye black 0.6%in the second stage of the dyeing is carried out at a flow rate of anionic dye black to 0.5% by weight of cement, the retanning chrome tanning agent is carried out at the flow rate of 1.0%, and the processing of spun butter is carried out at a flow rate of 0.8% by weight of the semifinished product.

Example 4. Prefabricated lining leathers obtained by known techniques from pork raw materials, processed as in example 1, but the first and second stages of dyeing is carried out at a flow rate of anionic dye black, 0.4% by weight of cement, the retanning chrome tanning agent is carried out at the flow rate of 0.5%, and the processing of spun butter is carried out at a flow rate of 1.2% by weight of the semifinished product.

Example 5. Polyfab the ikat lining leather, obtained by known techniques from pork raw materials, processed as in example 1, but the first and second stages of dyeing is carried out at a flow rate of anionic dye black and 0.7% by weight of cement, the retanning chrome tanning agent is carried out at the flow rate of 1.2%, and the processing of spun butter is carried out at a flow rate of 0.6% by weight of the semifinished product.

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

Using the proposed method allows to obtain a lining skin from pork raw deep black color with high performance properties.

Table
IndicatorsExamplesThe placeholder
 12345 
The ultimate tensile strength of 10 MPa1,92,12,01,71,81,3
The elongation stress of 10 MPa, %252726232423
Color stability, points  /td>     
- to the dry friction555444
to wet friction555444
Resistance to perspiration, points444333

The way we produce leather lining pork raw material including degreasing semi-finished product, neutralization, dyeing and greasing, characterized in that the dyeing produced in two stages with intermediate rinsing the anionic dye black when its consumption at each stage of 0.5-0.6% by weight of cement, and after fatliquoring additionally carry out retanning chrome tanning agent in an amount of 0.6 to 1.0% by weight of semi-finished product, counting on the chromium oxide, and processing of spun oil in the quantity of 0.8-1.0% by weight of the semifinished product.



 

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