The way of processing leather

 

(57) Abstract:

The method relates to the processing of raw hides and can be used in the production of leather from the hides of cattle intended for the manufacture of Shoe uppers, garments and leather goods. The method includes retanning chrome tanning agent, neutralizing, filling, retanning vegetable tanning agent, dyeing and greasing. During retanning chrome tanning agent impose additional anionic dye in an amount of 1.0 to 1.5% by weight of shaved leather. Filling, retanning vegetable tanning agent and dyeing are in the same tank serial processing. First, the aqueous dispersion of the drug Polina 101 based polymer of acrylic acid with molecular weight 60000-65000, neutralized by alkali, or water dispersion of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized by alkali, in the amount of 4-5% by weight of shaved leather calculated on the dry matter for 35-40 minutes Then doublepane vegetable tanning agent, the introduction of a mixture of naphthalenesulfonate with high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 2.5-3% by weight of shaved leather and what it is treated with formic or acetic acid in the amount of 1-2% from the weight of shaved leather, it is greased and re-treated with acid to a pH of 3.6 to 3.8. The technical result is uniform filling of the skin with high elasticity, improved hygienic properties and increase the intensity and color fastness to dry and wet friction.

The invention relates to the leather industry, in particular to a method of treatment of skin obtained from raw materials of cattle intended for the manufacture of Shoe uppers, garments and leather goods.

There is a method of generation of leather, including retanning in the presence of a carboxyl-containing polymer water dispersion of acrylic polymer (BMP-3 or MO-30-K2, in the amount of 0.3 to 1.0% by weight of the semifinished product in the calculation of the dry residue, followed by neutralization, dyeing, greasing and trim (EN 2036972, 1995). However, this method does not allow to provide the necessary uniform fullness and softness of the skin with high hygienic properties. There is also known a method of processing leather, including retanning, neutralization, filling water-soluble acrylic polymer selected from the group comprising unsubstituted or substituted Homo - or copolymers of acrylic acid and animal protein at mass sootechestvennikami when the mass ratio of 0.75 to 1:1, by greasing and dyeing by well-known methods (GB 1322367, 1973).

The disadvantage of this method is that it does not allow the skin with high performance properties. Use for filling the skin of an aqueous solution of a copolymer of methacrylic acid and nitrile of acrylic acid at a mass ratio of 40-60:60-40 in the amount of 0.5 to 5.0% by weight of shaved leather, counting on dry residue, in the presence of sulphurating connections synthetic tanning agent BOPD when the mass ratio of the last and the specified copolymer, equivalent to 0.5-0.7:1 (SU 1752774, 1992), also does not allow to achieve uniform filling of the skin on all topographical areas. The obtained skin have a high hydrophilicity and low permeability. The closest analogue of the claimed method is a method of processing leather EN 2186116, 2002, according to which the technology of processing of hides includes all preliminary processes and operations, including otlochno-ash, pregabalina tanning, retanning chrome tanning agent in accordance with the standard method of production of leather for the uppers, followed by neutralization, filling a copolymer of acrylamide, methacrylic acid, Acrylonitrile, maleinos by weight of semi-finished product in a wet coefficient of 1.0 to 1.5 and a temperature of 40-45oC for 20-30 minutes, with a further doublepane organic tanning agent, in particular of vegetable tanning agent in the amount of 2-4% by weight of semi-finished product, considering tanney or tanning within 40-60 minutes, dyeing and greasing and final stages by standard methods.

Obtained in this skin have a fairly good physical and mechanical properties. However, their disadvantage is the relatively low permeability, component 25-28%, and a low color intensity and its resistance to wet and dry friction, component 4 points on a 5-point scale. The objective of the invention is to develop a way of processing leather, allowing to obtain uniformly filled in all topographical areas with improved hygienic properties and an increased rate of growth of their thickness, and with high color intensity and its resistance to dry and wet friction. The problem is solved in that in the processing method of the skin, including retanning chrome tanning agent, neutralizing, filling, retanning vegetable tanning agent, dyeing and greasing, in the process for retanning chrome tanning agent further added anion is dyeing are in the same tank sequential processing of the first aqueous dispersion of the drug Polina 101 based polymer of acrylic acid with molecular weight 60000-65000, neutralized with alkali, or water dispersion of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized by alkali, in the amount of 4-5% by weight of shaved leather calculated on the dry matter for 35-40 minutes, further doublepane vegetable tanning agent, the introduction of a mixture of naphthalenesulfonate with high molecular weight anionic surface-active agent in their mass ratio 75-99: 1-25 in the amount of 2.5-3% by weight of shaved leather, and anionic dye in the amount of 2-3% by weight of shaved leather, and carrying out dyeing for 50-60 minutes followed by treatment with formic or acetic acid in the amount of 1-2% by weight of shaved leather, greasing and re-processing of formic or acetic acid to a pH of 3.6 to 3.8.

Used drug Polina 101 is an aqueous dispersion of anion active polymer of acrylic acid with molecular weight 60000-65000 obtained by polymerization of acrylic acid in a nitrogen atmosphere without oxygen, neutralized with alkali, with mass fractions of the basic substance is not less than 30%, mainly 30-35%.

Used drug Polina 105 is an aqueous dispersion of polymer acre, neutralized with alkali, with mass fractions of the basic substance is at least 35%, mainly 30-35%.

Used dispersant NF represents the disodium methylenbis (naphthalenesulfonate). As naphthalenesulfonate can also be used nekal, representing a mixture of sodium mono-, di - and tributyl-1-naphthalenesulfonate; wetting NB represents sodium butylnaphthalene, and other known naphthalenesulfonate. As a high molecular weight anionic surfactants can be used CnH2n+1where n=30. When this mass ratio naphthalenesulfonate and high molecular weight anionic surfactant is in the range of 75-99:1-25. The following examples explain but not limit the present invention.

Example 1. The semi-finished product obtained by standard methods from the skins of cattle, are doublepane chrome tanning agent with the basicity of 36-42% (counting on the chromium oxide) in an amount of 0.8% by weight of shaved leather, counting on the chromium oxide in the presence of 1% by weight of shaved leather dyes Acid brown To skin and then subjected to neutralization by well-known methods. After nnne sequential processing of the first 30-35% water dispersion of the drug Polina 101 in the amount of 4% by weight of shaved leather for 40 minutes, and then vegetable tanning agent, Quebracho in the amount of 4% by weight of shaved skin within 30 minutes. After filling and retanning in the same tub injected a mixture of naphthalenesulfonate and high molecular weight anionic surfactants when the mass ratio 75-99:1-25 in the amount of 3% by weight of shaved leather and dye Acid brown 2K in the amount of 2.5% by weight of shaved leather carrying out dyeing within 60 minutes. This is followed by treatment with formic acid in the amount of 1% by weight of shaved skin for 15 minutes and drain the spent solution. Subsequent phases include the fatliquoring process, which is carried out by well-known methods for 60 minutes, and the treatment with formic acid to a pH of 3.8. The obtained facial skin has the following characteristics: skin thickness is 1.5 mm; the permeability is 2.5 min; relative permeability is 30%, the rigidity of the device PIU, N, is 0.075.

The color indices of the skin: the skin color is uniform, high intensity and resistance to dry and wet friction, component 5 points on the gray scale standards. Depth Progresa is 100%. Studies have shown that the use of spasolstek provides good uniformity of filling the skin on all topographical areas. While the same effect is observed when using the water dispersion of the drug Polina 101 in the amount of 1.5% by weight of shaved leather calculated on the dry matter. When using the dispersion of the drug Polina 101 in the amount of less than 1.0% by weight of shaved leather calculated on the dry matter uniformity of content of the skin decreases slightly.

Example 2. The semi-finished product obtained by standard methods from the skins of cattle, treated as in example 1, but in the process of retanning chrome tanning agent injected 1.5% by weight of shaved leather dyes Acid brown To skin, and filling, retanning vegetable tanning agent and dyeing are in the same tank sequential processing of the first 30-35% water dispersion of the drug Polina 105 in an amount of 5% by weight of shaved leather for 35 minutes and then flood tanning extract in the amount of 4% by weight of shaved leather for 35 minutes. After filling and retanning in the same tub injected a mixture of naphthalenesulfonate and high molecular weight anionic surfactants when the mass ratio 75-99:1-25 in the amount of 2.5% by weight of shaved leather and dye Acid brown 2K in the amount of 3.0% by weight of shaved leather stroganow skin for 15 minutes and drain the spent solution. Subsequent phases include the fatliquoring process, which is carried out by well-known methods for 60 minutes, and the treatment with formic acid to a pH of 3.6. The obtained facial skin has the following characteristics: skin thickness is 1.4 mm; permeability is 2.7 min; relative permeability - 29%, the rigidity of the device PIU, N., and 0.08.

The color indices of the skin: the skin color is uniform, high intensity and resistance to dry and wet friction, component 5 points on the gray scale standards. Depth Progresa is 100%.

Studies have shown that the use of the method according to example 2 aqueous dispersion of drug Polina 105 in an amount of 5% by weight of shaved leather calculated on the dry matter provides good uniformity of filling the skin on all topographical areas. While the same effect is observed when using the water dispersion of the drug Polina 105 in the amount of 1.5 and 2% by weight of shaved leather calculated on the dry matter. When using the dispersion of the drug Polina 105 in the amount of less than 1.0% by weight of shaved leather calculated on the dry matter uniformity of content of the skin decreases slightly.

Pore 2, but in the process of retanning chrome tanning agent is administered to 1.2% by weight of shaved leather Acid brown To skin, and filling, retanning vegetable tanning agent and dyeing are in the same tank sequential processing of the first 30-35% water dispersion of the drug Polina 105 in an amount of 5% by weight of shaved leather for 35 minutes and then tanning extracts of Mimosa in the amount of 4% by weight of shaved leather for 35 minutes. After filling and retanning in the same tub, introduce a product based on a mixture of wetting NB and Oxanol L-CS in their mass ratio of 75:25 in the amount of 2.5% by weight of shaved leather and dye Acid brown 2K in the amount of 3.0% by weight of shaved leather carrying out dyeing within 60 minutes. This is followed by treatment with acetic acid in the amount of 2% by weight of shaved skin for 15 minutes and drain the spent solution. Subsequent phases include the fatliquoring process, which is carried out by well-known methods for 60 minutes, and the treatment with formic acid to a pH of 3.6. The obtained facial skin has the following characteristics: skin thickness is 1.4 mm; permeability is 2.4 min; relative permeability - 28%, the rigidity of the device PIU N - 0,09. OCD is engaged in 5 and 4 points respectively on a scale of gray samples. Depth Progresa is 100%.

Using the method according to example 3 aqueous dispersion of drug Polina 105 in an amount of 5% or 1.5% by weight of shaved leather calculated on the dry matter also provides a good uniformity of filling the skin on all topographical areas. However, by using a dispersion of the drug Polina 105 in the amount of less than 1.0% by weight of shaved leather calculated on the dry matter uniformity of content of the skin decreases slightly.

Thus, the proposed method allows to obtain a uniformly filled and painted leather with high elasticity, improved hygienic properties, increased color intensity and its resistance to dry and wet friction.

The way of processing leather, including retanning chrome tanning agent, neutralizing, filling, retanning vegetable tanning agent, dyeing and greasing, characterized in that the process for retanning chrome tanning agent impose additional anionic dye in an amount of 1.0 to 1.5% by weight of shaved leather, and filling, retanning vegetable tanning agent and dyeing are in the same tank sequential processing of the first aqueous dispersion of the drug Polina 101 OS is her drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized with alkali, in the amount of 4-5% by weight of shaved leather calculated on the dry matter for 35-40 min, and then the vegetable tanning agent, followed by the introduction of a mixture of naphthalenesulfonate and high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 2.5-3% by weight of shaved leather and anionic dye in the amount of 2-3% by weight of shaved leather and carrying out dyeing for 50-60 min, further processing of formic or acetic acid in the amount of 1-2% by weight of shaved leather, by greasing and re-processing of formic or acetic acid to a pH of 3.6 to 3.8.

 

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