Method for leather staining

FIELD: physical method for leather staining.

SUBSTANCE: claimed simplified method includes spraying of dyeing composition, containing (mass %): diphenylamine 0.3-2.0; tetrabromomethan 5.0-10.0; α-naphthol 0.01-0.03; and balance: methyl methacrylate-based varnish, onto the leather face, followed by ultraviolet exposure with wave-length of 300-400 nm at 25-300C for 0.5-1.0 min. Ferrocene and/or indole may be added in dyeing composition to complete color variety.

EFFECT: leather with improved hydrophobicity and physicochemical resistance.

2 cl, 2 tbl, 3 ex

 

The invention relates to a method of dyeing leather, including physical processing methods.

A method of processing hides, skins or collagen sheet materials using a liquid under pressure or liquefied gases (WO 9408054). In accordance with the known method, the impregnation of the processed material active ingredients, including dyes and/or water-repellent substances, perform under pressure, high temperature and in the presence of liquefied carbon dioxide. The disadvantages of the known method is the complexity of its instrumental reproduction, a multi-stage and, as a consequence, the high cost.

There is also known a method of dyeing, fatliquoring and fastening of the skin, including the stage of vaporization of workpiece (EP 1241270). The use of a known process, as well as previous similar, requires more complex equipment and does not provide the possibility of achieving the hydrophobic effect of the coating.

Closest to the claimed method according to essential features is the way of fixing the paint on organic material with UV rays (EP 0532467, 92810680). Adopted for the prototype. In accordance with the known method a paint containing at least one polymerizable double bond or cu is ina least one polymerizable cyclic system, fixed on the organic material by illuminating the ultraviolet rays in the presence of at least one colorless binder that includes at least one polymerizable double bond and at least one photosensitive component or other appropriate auxiliary component and a coloring agent. The known method is intended primarily for the dyeing of synthetic organic material, mainly of fibers, and may not be used for dyeing leather. The disadvantages of the known compositions, impede the achievement of the following technical results are: the high cost specially synthesized component polymerizable by exposure to UV radiation; the absence of hydrophobicity of the surface layer.

The claimed invention is directed to solving the task of creating a technologically simple method of dyeing leather with wide color gamut for long products without loss of staining intensity. The inventive method allows to achieve the following technical and economic results:

- increased stability of the dye to the atmospheric, mechanical, and other types of impact;

- increase the operation life of finished products without loss of appearance is;

the hydrophobicity of finished products;

- single-stage process of dyeing process - the combination of primary and top dyeing;

- suitability for subsequent mechanical processing: stamping, bending, cutting;

- significant reduction of time and material costs.

The above results in the implementation of the claimed invention are achieved due to the fact that the coloring of the skin is carried out by spraying the dye composition on the front surface of the skin followed by exposure to ultraviolet radiation of a wavelength of 300-400 nm at a temperature of 25-35°for 0.5-1.0 min Dyeing composition comprises (wt.%):

diphenylamine 0,3-2,0

tetrabromomethane 5,0-10,0

α-naphthol 0,01-0,03

the lacquer on the basis of methyl methacrylate else

The lacquer on the basis of methyl methacrylate mostly use lacquer AK-113 (GOST 23832-79)representing the solution of polyacrylic resin in a mixture of organic solvents with addition of plasticizer.

The invention consists in the following.

When using currently known methods of dyeing leather, including physical processing methods, the effect of fixing layer of the dye on the surface of the skin is achieved by increasing the depth of penetration of the coloring composition in the structure of the material. The inventive method is rasenia skin based on the property of the occurrence of adhesion of the coloring composition to the facial skin layer. When this is present in the composition promoterami component, such as tetrabromoethane, under the influence of UV radiation reacts with diphenylamine, forming a compound which has an intense blue colour, acrylic lacquer plays the role of the media and provides hydrophobic properties of the composition. Catalyst reaction successfully performs α-naphthol. The inclusion in the composition of ferrocene and/or indole in different proportional ratio allows to obtain products having colouring wide range of colors: black, brown, eggplant, red and so on

UV radiation also provides the fixation of the coloring, with further exposure to natural UV radiation during operation of the product not only does not cause discoloration of the painted surface, as with traditional methods of painting, but, on the contrary, creates the effect of increasing the intensity and durability of the color.

High adhesion of the dye to the facial skin layer creates an opportunity to prevent slipping of the dye, as well as the restructuring of the surface film due to the atmospheric, mechanical, and other types of impact.

To verify operational properties of the skin, painted by the claimed method, were tested for physico-mechanical properties (GOST 939-88) of different types of leathers, dyed using is the use of the proposed method. The test results are reflected in the following tables 1 and 2.

Table 1.

The resistance of the coatings to repeated bending and wet friction
 Wet friction (momentum)Repeated bending (number of bends)
The appearance of the skin(the norm for all types of skin)The inventive method(the norm for all types of skin)The inventive method
Yalova chrome200200015002000
Pork chrome200200015002000
Kid goat40200015002000
Table 2

The adhesion of the coating film (the load on m2not less than)
 To dry skinTo wet skin
 natural outer surface With a polished outer surfaceNatural outer surfaceWith a polished outer surface
(the norm for all types of skin)100706070
The inventive methodExfoliation of the coating paint is together with the facial skin layer

The method is as follows.

Cake mix, prepared for dyeing, process coloring composition and then dried, combining the operation of drying with UV radiation. Coloring composition is applied to the obverse surface of the skin by spraying using a spray gun or other special devices. The quantitative content of the main ingredients of the dye composition depends on the desired color scheme, type of exposed skin dyeing, but also on the method of pretreatment. In particular, the composition of the ink composition and its consumption depends on the color of the cake mix. The flow of dye is 200-250 g/sq.m. Combined operation of drying with UV radiation is carried out at a temperature of 25-35°C. Fixation of the dye on the surface of the skin carry out UV rays with a wavelength of 300-400 nm for 0.5-1 is in depending on the intensity of the radiation.

The inventive method can be used for applying coating paint on the skin and products, painted by traditional technology, for example, drum-dyed.

Examples of dye compositions for dyeing leather in various colors.

1. Red

- diphenylamine 0,5-0,7%;

- promoterami component of 5.0-10.0%;

- α-naphthol 0,01-0,03%;

- indol 0,5-1,0%;

- lacquer-based methacrylate else.

To get brown the surface of the skin produce the following dyeing composition:

- diphenylamine 0.3 to 0.5%;

- promoterami component of 5.0-10.0%;

- α-naphthol 0,01-0,03%;

- indol 0,7-1,0%;

- ferrocen 0,8-1,2%;

- lacquer-based methacrylate else.

To obtain a black color surface treatment of the skin produces the following dyeing composition:

- diphenylamine 1.0 to 2.0%;

- promoterami component of 6.0-8.0%;

- α-naphthol 0,01-0,03%

- ferrocen 0,6-0,9%

the lacquer on the basis of methyl methacrylate else.

Thus, the presented data suggest that the inventive method of dyeing the leather meets the patentability criteria and has considerable advantages over known compositions and methods of the same purpose.

1. Method of dyeing leather, including overspray on the front surface of the leather dyeing composition, sod is rasego, wt.%:

Diphenylamine0,3-2,0
Tetrabromomethane5,0-10,0
α-Naphthol0,01-0,03
The lacquer on the basis of methyl methacrylateRest

with subsequent exposure to ultraviolet radiation of a wavelength of 300-400 nm at a temperature of 25-35°for 0.5-1.0 min

2. The method according to claim 1, characterized in that the dye composition further added ferrocene and/or indole.



 

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The invention relates to dyes for dyeing, finishing and toning products from genuine leather

FIELD: physical method for leather staining.

SUBSTANCE: claimed simplified method includes spraying of dyeing composition, containing (mass %): diphenylamine 0.3-2.0; tetrabromomethan 5.0-10.0; α-naphthol 0.01-0.03; and balance: methyl methacrylate-based varnish, onto the leather face, followed by ultraviolet exposure with wave-length of 300-400 nm at 25-300C for 0.5-1.0 min. Ferrocene and/or indole may be added in dyeing composition to complete color variety.

EFFECT: leather with improved hydrophobicity and physicochemical resistance.

2 cl, 2 tbl, 3 ex

FIELD: leather industry.

SUBSTANCE: invention relates to area of dyeboarding operations in leather production, in particular to a method of dyeing genuine leather with active dyes including intermediate product neutralization, active dye dyeing and subsequent fixation with alkaline reagent. According to invention, neutralization is effected in presence of preparation "Deep Dying" in amount 4.5-5.0% of the weight of planned leathers, dyeing is effected with active dye consumed in amount 2.5-5% at medium pH 3.4-3.5 in presence of 0.9-1.2 g/L alizarin oil, and fixation of dye is performed simultaneously with greasing at medium pH 8.5-8.9 with sodium hydrocarbonate consumed in amount 1.3-1.8%, greasing composition in amount 3.8-4.2%, and "Polinap AD" in amount 1.8-2.2 of the weight of planned leathers. Finally leather is rinsed in presence of nonionic surfactant consumed in amount 0.8-1.2 g/L.

EFFECT: optimized dyeing composition and dyeing conditions.

1 tbl, 9 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: 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: physical method for leather staining.

SUBSTANCE: claimed simplified method includes spraying of dyeing composition, containing (mass %): diphenylamine 0.3-2.0; tetrabromomethan 5.0-10.0; α-naphthol 0.01-0.03; and balance: methyl methacrylate-based varnish, onto the leather face, followed by ultraviolet exposure with wave-length of 300-400 nm at 25-300C for 0.5-1.0 min. Ferrocene and/or indole may be added in dyeing composition to complete color variety.

EFFECT: leather with improved hydrophobicity and physicochemical resistance.

2 cl, 2 tbl, 3 ex

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