Composition for finishing natural leather

 

(57) Abstract:

Usage: for decorating leather, in particular for coating dyeing. The essence of the invention: composition for finishing natural leather contains wt.%: pigment concentrate 18,0-23,0; 10% casein 8,0-10,0; 20% wax emulsion 9,0-11,0; 40% aqueous dispersion of a copolymer of butyl acrylate, Acrylonitrile, and methacrylic acid(70:25:5) 25,0-27,0; 30%-percent aqueous dispersion of a copolymer of n-butyl acrylate, glycidylmethacrylate and methacrylic acid(86:9:5) 7,0-9,0; 40%-percent aqueous dispersion of methyl acrylate, butyl acrylate and methacrylic acid (62:35:3) or 40%(percent) water dispersion of polyurethane 14,0-17,0 water and rest. table 2.

The invention relates to the leather industry and can be used for finishing leather, in particular for coating dyeing.

Known composition for finishing natural leather, containing, by weight. pigment concentrate 15,0-16,0; casein (10%) 2.8 to 3.5; a wax emulsion (20%) of 2.0 to 3.0; aqueous emulsion copolymer of ethyl acrylate, Acrylonitrile and methacrylic acid in the ratio 85:13:2 (40%) 20,0-21,6; triethanolamine salt alkylphosphonic acids on the basis of a secondary fatty alcohol fraction C10-C203.0 to 3.5 and water the rest [1]

Most blisteringly concentrate 9,8; casein (10%) 3,4; wax emulsion (20%) 1,5; acrylic emulsion of BMP-3 (20%) 17,6; the variance MH-30 (20%) 23.5 and water the rest [2]

The disadvantage of these compositions is that they do not provide a coating on the skin with high resistance to repeated bending.

The technical result of the invention is to improve the stability of the coating to repeated bending.

This result is achieved by the fact that the composition for finishing natural leather that includes a pigment concentrate, casein, wax emulsion, polymer binders and water, as the polymer film contains a mixture aqueous dispersion of a copolymer of butyl acrylate, Acrylonitrile, and methacrylic acid in the ratio of 70:25:5 and aqueous dispersion of a copolymer of n-butyl acrylate, glycidylmethacrylate and methacrylic acid in a ratio of 86:9:5 in combination with a water dispersion of a copolymer of methyl acrylate, butyl acrylate and methacrylic acid in a ratio of 62:35:3 or aqueous dispersion of polyurethane in the following ratio, wt.

Pigment concentrate 18,0 23,0

Casein (10%) 8,0 10,0

Wax emulsion (20%) 9,0 11,0

Aqueous dispersion of a copolymer of butyl acrylate, Acrylonitrile, and metacello is immutability and methacrylic acid in a ratio of 86:9:5 (Madol-3Y) (30%) 7,0 9,0

Aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate and methacrylic acid in a ratio of 62:35:3 (BMP-3) (40%) or aqueous dispersion of a polyurethane PI 3925 (40%) 14,0 17,0

Water the Rest

Introduction to composition as a polymeric film-forming aqueous dispersions of HAC 200M and Madol-3G, containing not only carboxyl groups but also reactive nitrile and Picadilly group capable of forming a three-dimensional spatial structure, in combination with a water dispersion of BMP-3 or dispersion PU contributes to the strong binding of these film-forming agents among themselves and with the functional groups of the protein of the skin, which improves the stability of the coating to repeated bending.

Introduction to composition for finishing HAC-200M less than 25.0% of Madala-3Y less than 7.0 wt. BMP-3 or dispersion PU less of 14.0 wt. not possible to obtain a coating with a high resistance to repeated bending, and the introduction of HAC-200M more to 27.0 wt. Madala-3G more of 9.0 wt. BMP-3 or dispersion PU more of 17.0 wt. leads to a significant increase in the viscosity of the composition, which makes its application to the surface of the skin.

Synthesis variance HAC-200M carried out by the method of emulsion polymerization. The duration of lnasty, first enter butyl acrylate and Acrylonitrile. Through a 3.0-3.5 hours from the start of the synthesis add methacrylic acid. The ratio of monomers in the copolymer, respectively 70:25:5.

Synthesis of a dispersion Madol-3G are also carried out by the method of emulsion polymerization. Duration dosage monomers is 5.5 to 6.0 h at 75-80oC. Loading of the monomers is carried out in the following sequence: first, enter n-butyl acrylate and glycidylmethacrylate. After 2.5-3.0 hours from the beginning of the synthesis add methacrylic acid. The ratio of monomers in the copolymer, respectively 86:9:5.

The composition is prepared as follows: a 40 percent aqueous dispersion of HAC-200M mixed with 30% aqueous dispersion of Madol-3Y and 40% aqueous dispersion of BMP-3 or 40% aqueous dispersion PU RI. In the resulting mass gradually with careful stirring of the pigment concentrate, 10% solution of casein, 20% wax emulsion and water.

The specific formulations for finishing are presented in table.1. These compositions are applied to the semi-finished chrome tanned with a polished or natural outer surface on the roller machine. The flow rate of 80-120 g/m2. After drying the skin and fix the Lena in the table.2.

The proposed structure provides for obtaining coatings with high resistance to repeated bending.

Composition for finishing natural leather that includes a pigment concentrate, casein, wax emulsion, polymer binders and water, characterized in that the polymer film contains a mixture aqueous dispersion of a copolymer of butyl acrylate, Acrylonitrile, and methacrylic acid in the ratio of 70 25 5 and aqueous dispersion of a copolymer of n-butyl acrylate, glycidylmethacrylate and methacrylic acid in a ratio of 86 9 5 in combination with a water dispersion of a copolymer of methyl acrylate, butyl acrylate and methacrylic acid in the ratio of 62 35 3 or aqueous dispersion of the polyurethane in the following ratio, wt.

Pigment concentrate 18 23

Casein (10%) 8 10

Wax emulsion (20%) 9 11

Aqueous dispersion of a copolymer of butyl acrylate, Acrylonitrile, and methacrylic acid in the ratio of 70 25 5 (40%) 25 27

Aqueous dispersion of a copolymer of n-butyl acrylate, glycidylmethacrylate and methacrylic acid in a ratio of 86 9 5 (30%) 7 9

Aqueous dispersion of a copolymer of methyl acrylate, butyl acrylate and methacrylic acid in the ratio of 62 35 3 (40%) or in the

 

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