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 
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 
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
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
FIELD: light industry.
SUBSTANCE: powdered thermoplastic polyurethane with reduced melting point is applied on fur article parts in most wear place, said polyurethane being prepared from 4,4-diphenylmethanediisocyanate, poly(butylene glycol adipate) and 1,4-butanediol serving as chain extension agent. Thus treated part is then pressed at 64-75°C and remained to lie.
EFFECT: improved quality of fur articles due to increased hair-to-skin tissue binding strength, resistance of hair coat against wear, and increased lifetime of clothes.
FIELD: leather industry.
SUBSTANCE: invention relates to finishing of various-destination leathers made from various types of raw skins and consists in consecutively applying layers of soaking ground, covering paint, and fixing agent. After applying each layer, leather is dried for 5 to 50 sec in microwave fields at field intensity 10000-15000 v/m and power 300-3500 W.
EFFECT: expanded technological possibilities and improved quality of coating.
1 tbl, 5 ex
FIELD: tanning industry.
SUBSTANCE: process is conducted in vertical mill to which soot, induline, kerosene and diesel fuel are introduced. Then components are mixed and slow heating the apparatus and its content is started after which mixing is switched off and slow heating of mill content is continued. Upon expiration of said time, acids or their compositions, white spirit and fatty additive are introduced and chemical mass-exchange process is performed at spontaneously fixed temperature due to thermal effects of this process and natural cooling at the beginning and at the end, as well as due to forced cooling at intermediate stage characterized by high rates of temperature at maximum of 140-150°C. At the moment when forced cooling is discontinued, 0.5-1.5 h before discontinuation of mixing and beginning of withdrawal at temperature of 80-115°C, 43-52-% solution of aluminum salts and C10-C20 of carboxylic acids is introduced into product being prepared.
EFFECT: facilitated procedure; increased amount of product.
1 tbl, 15 ex
FIELD: light industry; methods of forming of volumetric and curvilinear details for an article.
SUBSTANCE: the invention is pertaining to the field of light industry, in particular, to the methods of forming of volumetric and curvilinear details for an article is intended for usage in light industry at forming volumetric and curvilinear details for articles made out of a leather, predominantly - clothing. The method consists that on the surface of the flesh side of hide of the flat component of the article made out of leather deposit the polymeric composition containing the following elements (in mass %): - polyvinyl acetate homopolymeric coarse-dispersed plasticized dispersion - 20-35; - dibutyl phthalate (DPHT) - 1.5-15; - water - the rest. The composition may be deposited in the form of a net on in advance prepared templates. After that the component of the article is dried at an indoor temperature. Then the component of the article is formed, for example, by hot pressing at 70-90°C during 1.5-2.0 minutes. And fix the gained form by chilling. The invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.
EFFECT: the invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.
FIELD: leather industry.
SUBSTANCE: preparation of composition is conducted on vertical-type bead mill. Induline, kerosene, and diesel fuel are consecutively charged into mill before stirring mechanism is energized, after which apparatus and contents thereof are slowly heated. Stirring is then stopped for 1 h while slow heating of mill contents is continued. When specified time expires, carboxylic acid or acid mixture, white spirit, fat additive, and aluminum oxide or hydroxide are added. Mechanic stirring is then switched on and contents of the bead mill are ground and the process is carried out at spontaneously fixed temperature caused by heat effects of the processes and natural cooling. When temperature is lowered to 85-120°C, desired product is discharged.
EFFECT: simplified process and increased product discharge degree.
1 tbl, 19 ex
FIELD: leather industry.
SUBSTANCE: invention relates to wax emulsions used in coating pain composition designed for finishing genuine leathers and provides a wax emulsion component, which represents polyvinylacetate dispersion containing non-plasticized polyvinylacetate in amount at least 45 wt %, content of polyvinylacetate dispersion in wax emulsion ranging from 40 to 80%. Proposed component when used in wax emulsion allows leather coatings to be obtained manifesting good organoleptic properties, high temperature resistance, low tackiness, and agreeable leather to the touch at moderate cost of wax emulsion.
EFFECT: improved consumer's quality and enlarged resource of wax emulsion components.
1 tbl, 6 ex
FIELD: leather industry.
SUBSTANCE: method, which is suitable for finishing chrome leathers, comprises consecutively applying coating layers followed by action with low-temperature plasma at generator lamp anodic current intensity 0.2-0.6 A. Action of low-temperature plasma is effected for 180-240 sec at pressure 13.3-26.6 Pa in discharge chamber and consumption of plasma-forming gas (argon) 0.035-0.04 g/sec. Method is implemented on high-frequency plasma installation.
EFFECT: increased adhesion of coating to dry and wet leather, dye penetration depth, resistance to repetitive bends, and strength at better quality of leather.
FIELD: process engineering.
SUBSTANCE: proposed method comprises eliminating defects representing damages sports (3) in layers (2) formed by recesses in skin (1) with natural grain patter. These defects are eliminated as follows, i.e. water or slightly foamed plastic suspension is forced into aforesaid recesses, the said suspension containing ultimate solid particles. Then skin (1) is dried, surface (4) of the layer of grain pattern (2) is subjected to pressure and thermal treatment with the help of pressure roller at least 100°C. Note here that plastic mass is formed in aforesaid recesses that contains hollow tiny balloons (5) made up of solid particles to completely fill the said recesses (dwg. 1).
EFFECT: higher quality.
13 cl, 1 dwg, 1 ex
FIELD: process engineering.
SUBSTANCE: all layers of undercoat and finish paint are applied on leather subjected, prior to drum painting, to low-temperature non-equilibrium plasma of high-frequency discharge. Exposure is performed for 241 to 280 seconds in discharge chamber at 26.7 to 30.0 Pa, flow rate of plasma-forming argon making 0.041 to 0.06 g/s at discharge power of 0.7 to 2 kW.
EFFECT: increased depth of paint penetration, improved quality of ready leather.
1 dwg, 1 tbl