The method of manufacture from leather velour

 

(57) Abstract:

The method relates to the production of leather from leather obtained from raw materials of cattle intended for the manufacture of Shoe uppers, garments and leather goods. The method includes retanning chrome tanning agent, neutralizing, first greasing greasing emulsion of 5 to 6% by weight of semi-finished product per 100% fat, drying, aging, Taiko, maceration, dyeing, second creasing and handling formic or acetic acid. The first creasing are simultaneously filled with liquid ratio of 0.8-1.0 and a temperature of 40-45oSequential treatment with an aqueous solution of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized by alkali, in the amount of 3-4% by weight of the semifinished product in the calculation of the dry residue, synthetic tanning agent in the amount of 2.5% to 3% by weight of prefabricated calculated on the dry matter, greasing emulsion, aqueous dispersion of the drug Polina 22 on the basis of a copolymer of butyl acrylate, methacrylic acid and styrene in the amount of 1,5-2% by weight of the semifinished product in the calculation of the dry residue, then formic or acetic acid in the amount of two at 50-60oWith, and dyeing and greasing is carried out at a liquid rate of 0.8-1.0 and a temperature of 50-60oWhen the flow of dye 6-7% by weight of semi-finished products and greasing emulsion - 3-4% by weight of semi-finished product per 100% fat, in the presence of a mixture of naphthalene sulfonate and high molecular weight anionic surfactant in the amount of 1-2% by weight of the semifinished product. The technical result is an increase in the intensity of staining and resistance to wet treatments, and improved hygienic properties and simplify technology.

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

There is a method of making leather from leather, including retanning in the presence of a carboxyl-containing polymer water dispersion of acrylic polymer (BMP-3 or MO-30-K2, taken in an amount of 0.3-1.0% 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 napolnennosti the Spilka, 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 ratio of 1:12 to 12:1 and then adding the product of the condensation of formaldehyde, dihydroxydiphenylsulfone and naphthalenesulfonate when the mass ratio of 0.75:1:1, greasing and dyeing by well-known methods (US 1322367, 1973).

However, the known method does not allow to provide the necessary uniform fullness of the skin.

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 closest analogue of the claimed method is a method for the production of leather from leather, including retanning, neutralization, washing, obrabotkata), drying, aging, Taiko, double grinding, maceration in the presence of a base, dyeing anionic dyes, further greasing and processing of formic or acetic acid (RU 2039836, 1995).

The disadvantage of this method is the complexity of the technology, due to the necessity of using two grinding after the first fatliquoring and low hygienic properties of the obtained velour (vodopronitsaemosti in dynamic conditions is 0.5 minutes) and the lack of intensity and color fastness to dry friction, component 4 points.

The objective of the invention is to obtain from velour leather with high color intensity and resistance to wet treatments, and also with improved hygienic properties with simplified technology by eliminating the need for additional stages of grinding.

The problem is solved in that in the method of manufacture of leather from leather, including retanning chrome tanning agent, neutralizing, first greasing greasing emulsion of 5 to 6% by weight of semi-finished product per 100% fat, drying, aging, Taiko, maceration, dyeing, second creasing and orefficient of 0.8-1.0 and a temperature of 40-45oSequential treatment with an aqueous solution of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized by alkali, in the amount of 3-4% by weight of the semifinished product in the calculation of the dry residue, synthetic tanning agent in the amount of 2.5% to 3% by weight of prefabricated calculated on the dry matter, greasing emulsion, aqueous dispersion of the drug Polina 22 on the basis of a copolymer of butyl acrylate, methacrylic acid and styrene in the amount of 1,5-2% by weight of the semifinished product in the calculation of the dry residue, and then formic or acetic acid in a quantity of 0.8-1% by weight of cement, maceration is conducted in aqueous solution of nonionic surfactants at 50-60oWith, and dyeing and greasing is carried out at a liquid rate of 0.8-1.0 and a temperature of 50-60oWhen the flow of dye 6-7% by weight of semi-finished products and greasing emulsion - 3-4% by weight of semi-finished product per 100% fat, in the presence of a mixture of naphthalenesulfonate and high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 1-2% by weight of the semifinished product.

Used Polina 105 is a polymer of acrylic acid with molecular weight 30000-32000, who used Polina 22 is a copolymer of 63.6% of butyl acrylate, 20.8% of methacrylic acid and 15.6% styrene latex obtained by polymerization in the presence of the emulsifier alkylsulfonate sodium and initiator is ammonium persulfate.

As naphthalenesulfonate can be used dispersant NF representing the disodium methylenbis(naphthalenesulfonate); nical, representing a mixture of sodium mono-, di - and tributyl-1-naphthalenesulfonate; wetting NB represents sodium butylnaphthalene, and other known naphthalenesulfonate.

The following examples explain but not limit the present invention.

Example 1. Holeway botermans splits obtained from byczyna light in accordance with the standard method, after pickling subjected to the chrome tanning, planing and breakdown in the dryer for 20 minutes. Then split doubleval within 1 hour of chrome tanning agent in the amount of 1%, counting on the chromium oxide, and an organic tanning agent BOPD at 2%, counting on tanning. After neutralization of spent filling when liquid ratio of 1.0 and a temperature of 40oSequential treatment with an aqueous solution of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralizes tanning agent DFPM in the amount of 3% by weight of semi-finished product per tanning for 30 minutes, greasing emulsion in the amount of 6% by weight of semi-finished product per 100% fat for 60 minutes, then the aqueous dispersion of the drug Polina 22 on the basis of a copolymer of butyl acrylate, methacrylic acid and styrene in the amount of 2% by weight of the semifinished product in the calculation of the dry residue in 40 minutes, and then formic acid in the amount of 1% by weight of semi-finished within 20 minutes. Next conducted maceration in an aqueous solution of nonionic surface-active substances (surfactants)-Cintanya (at a ratio of 300% water and 0.3% surfactant) at 60oC for 2 hours, after which the produced water drainage. Subsequent dyeing and greasing was conducted at a liquid factor of 1.0 and a temperature of 60oWith the presence of a mixture of naphthalenesulfonate and high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 1-2% by weight of the material with the use of dye acid black in the amount of 6% by weight of semi-finished within 1 hour and greasing emulsion in the amount of 3-4% by weight of semi-finished product per 100% fat for 1 hour. Then there was the treatment with formic acid in the amount of 1% by weight of semi-finished within 20 minutes.

Received velour has the following characteristics: the average is 2.7 percent, rigidity, TOS, PIU-17,5.

In the dyeing process the dye is almost completely is selected from a dye bath. While the color velour intense, intense and uniform in all topographical areas. With a high resistance to dry and wet friction, component 5 points and 4 points respectively on a 5-point scale.

Example 2. Holeway botermans splits obtained from byczyna heavy standard technique, was processed as in example 1, but the filling was carried out at liquid ratio of 0.8 and a temperature of 45oSequential treatment with an aqueous solution of the drug Polina 105 based polymer of acrylic acid with molecular weight 30000-32000, neutralized by alkali, in the amount of 3% by weight of prefabricated calculated on the dry matter, within 20 minutes, synthetic tanning agent DFPM in the amount of 2.5% by weight of semi-finished product per tanning for 20 minutes, greasing emulsion in an amount of 5% by weight of semi-finished product per 100% fat for 50 minutes, then the aqueous dispersion of the drug Polina 22 on the basis of a copolymer of butyl acrylate, methacrylic acid and styrene in the amount of 1.5% from the mass of the semi-finished product based on the dry residue within 30 minutes, the W in an aqueous solution of nonionic surface-active substances (surfactants)-Neonols (at a ratio of 300% water and 0.3% surfactant) at 60oC for 2 hours, after which the produced water drainage. Subsequent dyeing and greasing was conducted at a liquid rate of 0.8 and a temperature of 50oWith the presence of a mixture of naphthalenesulfonate and high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 1% by weight of the material with the use of dyes acid brown To the skin in an amount of 7% by weight of semi-finished within 1 hour and greasing emulsion in the amount of 4% by weight of semi-finished product per 100% fat for 1 hour. Then there was the treatment with acetic acid in the amount of 2% by weight of semi-finished product for 25 minutes.

Physico-mechanical, color and strength properties obtained with this velour, similar to example 1.

The way to find from velour leather, including retanning chrome tanning agent, neutralizing, first greasing greasing emulsion of 5 to 6% by weight of semi-finished product per 100% fat, drying, aging, Taiko, maceration, dyeing, second creasing and handling formic or acetic acid, wherein the first creasing are simultaneously filled with liquid ratio of 0.8-1.0 and thy acids with a molecular mass of 30000-32000, neutralized with alkali, in the amount of 3-4% by weight of the semifinished product in the calculation of the dry residue, synthetic tanning agent in the amount of 2.5% to 3% by weight of prefabricated calculated on the dry matter, greasing emulsion, aqueous dispersion of the drug Polina 22 on the basis of a copolymer of butyl acrylate, methacrylic acid and styrene in the amount of 1,5-2% by weight of the semifinished product in the calculation of the dry residue, and then formic or acetic acid in a quantity of 0.8-1% by weight of cement, the maceration is conducted in aqueous solution neinogennye surfactant at 50-60C, and dyeing and greasing is carried out at a liquid rate of 0.8-1.0 and a temperature of 50-60C at a flow rate of dye 6-7% by weight of cement, and greasing emulsion - 3-4% by weight of semi-finished product per 100% fat, in the presence of a mixture of naphthalenesulfonate and high molecular weight anionic surfactants in their mass ratio 75-99:1-25 in the amount of 1-2% by weight of the semifinished product.

 

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