Composition for finishing natural leather

 

(57) Abstract:

The essence of the invention: composition for finishing leather contains, by weight. h: acrylic emulsion film formers 250 300 structurally-painted benzoquinonediimine oligomer 100 150, wax emulsion 5 20 and water to a density of 1.03-1.06 g/cm3table 2.

The invention relates to the leather industry and can be used when you finish genuine leather.

Known composition for finishing natural leather containing acrylic emulsion copolymer, the pigment concentrate, penetrator and supplements, and as an additive is used glycitin the condensation products of amino compounds with formaldehyde in the following ratio, wt. The acrylic dispersion of the first polymer or copolymer 25-36 Pigment con - Central 15-35 the Penetrator 1,0-2,0 Glycitin 5-8 Mixture of chetverti - governmental salt of diethyl - monometallic - left broadcast high - Shih fatty alcohols 1,5-3,0 Water the Rest

The prototype of the proposed technical solution is a composition for finishing natural leather, comprising, by weight.h. An aqueous solution of IU - luminova resin 70 Casein 240 Acrylate copoly - dimensional emulsion 80 Aqueous composition pigment 5 Liquid dye 10

Fault the practical properties, are characterized by bronzing effect. Dyes, loose polymeric coating, under the action of water and organic solvents migrate from the coating film, causing uneven coloring, shade variations.

The aim of the invention is the improvement of physical and mechanical properties of the coating.

This goal is achieved by the fact that the composition for finishing natural leather, including acrylic emulsion binders, amino, wax emulsion and water, as the resins contains structural-painted benzoquinonediimine oligomer, in the following ratio, wt.h. Emulsion acre - plate of plancor - identied 250-350 Structural-painted - tion of benzoguanamine - formaldehyde oligomer 100-150 Wax emulsion 5-20 Water to density improvement - Ty of 1.03 g/cm3< / BR>
Structural-colored oligomer was obtained as follows.

In a reactor with a stirrer pour 22,5 l of water and through the loading hatch is injected 4.5 kg of sodium hydroxide and stirred the reaction mass for 60 minutes Then injected 9,2 kg salicylic and 3.7 kg sulfanilic acid. The reaction mass is heated to a temperature of 65aboutC and maintained at this temperature, POS is the number of 11.8 l, in terms of formaldehyde is 4,58 kg

The temperature of the reaction mixture should not exceed 70aboutC. the dwell Time at this temperature 40-60 minutes Then loads of 8.3 kg of benzoguanamine. The reaction mass is heated to 80aboutC and maintained at this temperature 1.0 to 1.5 h, after which the load of 0.2 kg of dye and incubated the reaction mass within 1.0 to 1.5 h with constant stirring.

Get 51-53 kg of product with mass fractions of the basic substance is not less than 50% of Structurally colored benzoquinonediimine (BGAF) oligomer is a liquid, the color of which is determined by the dye used in the synthesis.

The pH of the product 8,0-8,5. Mass fraction of free formaldehyde not more than 1.0%

Molecular weight benzoquinonediimine oligomers without the introduction of dyes were determined by gel preparative chromatography and varies 470-870 unit

From theoretical assumptions, it follows that the molecular weight of the colored Batliwala should not differ from the values given above, since joining the macromolecule Batliwalla dye molecules on the one hand leads to some increase Batliwalla fewer than 100 wt.h. unable to get intensive colour of the skin surface, that is, to obtain compositions with sufficient opacity to mask the various defects of the facial skin surface (variation, minor scratches, the body's spots).

The introduction of Batliwalla more than 150 wt.h. impossible due to the fact that the increase rate of the oligomer leads to a sharp increase in the viscosity of the composition, followed by pressing of the skin effect in the adhesion to the plate of the press.

When the content of Batliwalla over 150 wt.h. the coating on the skin loses its elasticity due to the deterioration of its compatibility with the main film-forming.

Thus, in order to achieve sufficient coverage and to ensure the stability of the composition, as well as the processability of the coating method of spraying the contents of Batliwalla in the composition should be in the range of 100 to 150 wt.h.

Compositions for finishing are given in table. 1.

Reducing consumption acrylic film less than 250 wt.h. a negative impact on the physico-mechanical properties of the coating, in particular a low adhesion film in the wet state, and also causes deterioration of the compatibility of the components Parrilla coating film with a low resistance to deformation, leaves the skin rubbery feel and stickiness. Wax emulsion used to make the floor Shine and reduce stickiness. However, the minimum amount of wax emulsion in the composition should not be less than 5 wt.h. since otherwise the viscosity reaches high values, significant at practical work and manifested in the adhesion of the skin to the plate of the press.

When the content of the wax emulsion is more than 20 wt.h. loss of transparency of the coating film, it becomes dull, worse color effect coating dyeing.

Water is introduced into the coating paint in number, guaranteeing reception of the density of the composition in the range of 1.03-1.06 g/cm3providing optimal conditions for applying the composition by spraying method, due to the structural features of the spray device.

Technology of preparation of the composition is as follows.

Structural-painted benzoquinonediimine oligomer diluted with water in an amount of 50% by weight of the oligomer, add a wax emulsion and then add acrylate emulsion film formers. The resulting composition is diluted with water to a density of 1.03 g/cm3.when the temperature of the 35aboutC for 30 minutes

The test results of the coatings on the skin, obtained using the structure proposed in comparison with the prototype are given in table. 2.

The test results show that the opacity of the proposed structure in comparison with the prototype increases by 10-45% Improves the adhesion of the coating to the skin.

Increasing the opacity of the composition reduces its consumption, get on the skin thin film, resulting in a savings of chemicals and improve the quality of the skin.

COMPOSITION FOR FINISHING NATURAL LEATHER, including acrylic emulsion binders, amino, wax emulsion and water, characterized in that the resins it contains structural-painted benzoquinonediimine oligomer in the following ratio, wt.h.

Emulsion acrylic binders 250 300

Structural-painted benzoquinonediimine oligomer 100 - 150

Wax emulsion 5 20

Water to the density of 1.03 1.06 g/cm3The rest

 

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Method of finishing // 2017825

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.

4 cl

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 100C. 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

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