The method of dyeing the leather fur sheepskin and fur suede

 

(57) Abstract:

Fur sheepskin or fur suede after tanning, pickling and neutralization is subjected to dyeing solution containing, g/l: ammonia 0.5 to 1.5, the extract of buckwheat husk 0,5 - 5,0, nonionic surfactants, 0 to 20, acetic acid (formic) acid - 0,75 - 2,5 , water up to 1 l with 15 73oC for 1 to 3.5 hours Method allows to improve the environment and to ensure sustainable color wide color gamut. 2 C.p. f-crystals, 1 table.

The invention relates to light industry, and in particular to methods of dyeing furs.

Known methods of dyeing of fur skins using dyes belonging to different classes of organic compounds. However, the range of the used dyes is limited. This can be explained by the specificity of dyeing: to paint the leather and keep the natural color of hair, to paint hair in other desired tone or paint the leather and hair tone. On the basis of the coloring ability of the dyes can be divided into 3 groups: 1) the dyes, dye the leather, but not coloring hair, 2) dyes, coloring hair, but not coloring the leather, 3) the dyes, the dye is now dyes, representing azo dyes with group - N= N- (C. I. Belyakov and other Technology furs and fur sheepskin. M: Light industry, 1984, S. 149-150).

Known methods using dyes direct black 3SH fabric treatment (SU auth.St. 614142, class D 06 P 3/30 1978), black, D. and brown A (SU, ed.St. 306215, class D 06 P 3/30, 1978), acid black and chrome brown fur 2K (SU, ed.St. 891823, class D 06 P 3/30, 1982), suitable for the dyeing of fur sheepskin with beautification of hair.

The disadvantage is the inability to obtain a set of bright colors fur semi-finished product, and the use of toxic azo dyes, the use of which causes an increase in contamination of wastewater and sanitary-hygienic working conditions.

There is also known a method of processing furs by pickling, tanning, greasing and dyeing in a bath-based 3 g/l of the dye acid "Dark brown", 3 g/l of hydrosulfate and 1.5 ml per 1 l of ammonia at pH 6 and 60oC (single processing technology fur sheepskin. M.: 1973, S. 1 - 95).

The result is an intense brown color leather fur sheepskin and fur suede, with partial coloring of hair. The consequences of the TSS to the proposed method is a method of dyeing the leather sheepskin and fur suede by tanning, of pickling, neutralizing and dyeing solution containing the anionic dye, ammonia, nonionic surfactants, acetic acid and water at 35-65oC for about 2.5 hours, followed by washing and drying (SU, ed.St. 1719500, class D 06 P 3/32, 1992).

The purpose of the invention is the creation of a more environmentally friendly method of dyeing of fur skins, allowing for lower energy costs, get a great range of colours fur semi-finished product, with staining the leather and fur as tone on tone, and in different colors, including light.

This goal is achieved by the proposed method lies in the fact that for dyeing leather fur sheepskin and fur suede use a dyeing solution containing a natural dye - water-alkaline extract of buckwheat husk, method of production described in SU, ed.St. 1742295, class C 09 B 61/00, 1992).

Dyeing leather fur sheepskin and fur suede.

The sheepskin after tanning, pickling and neutralization is subjected to dyeing solution composition, g/l:

Ammonia is 0.5 to 1.5

Extract of buckwheat husk - 0,5-5,0

Acetic or formic acid - 0,75-2,5

Water up to 1 l

and the process is conducted at 15-73the gene surfactant to 2 g/L.

Sheepskin, after neutralization placed in a bath (the barge), liquid ratio is 20 add ammonia to create a specific pH, mix 3-5 minutes, then add the dye, mix 20-90 min, then add acetic or formic acid and stirred 35-110 min, then washed and dried.

After coloring the leather, if necessary, conduct colouring hair. To do this, use any dyes for hair, for example, mixed acid brown for fur - Kemerovo brown or Sullied black, Sallied brown RD. The results are shown in the table.

As can be seen from the results shown in the table, the proposed method of dyeing yields a stable, noble colouring leather fur sheepskin and fur suede and allows you to vary the color of fabric and fur. The proposed method is used on some fur factories and received positive feedback.

1. The method of dyeing the leather fur sheepskin and fur suede serial tanning, pickling, neutralizing and dyeing with subsequent washing and drying, characterized in that the dyeing is conducted by solution composition, g/l:

Ammonia is 0.5 to 1.5

The extract when the 3oC for 1 to 3.5 hours

2. The method according to p. 1, characterized in that dyeing is carried out solution, optionally containing neinogennye surfactant to 2 g/L.

3. The method according to PP.1 and 2, characterized in that after drying spend dyeing hair skins.

 

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The invention relates to leather production, in particular to the production technology of natural leather to get a fashionable color effect
The invention relates to dyes for dyeing, finishing and toning products from genuine leather

The invention relates to the field of aniline-dye industry, in particular to a method for acid yellow monoisocyanates (Dye acid yellow KIS), which can be used for dyeing fur sheepskin

The invention relates to dyes and can be used in the production of pigment concentrates of black color for dyeing leather

FIELD: fur industry.

SUBSTANCE: invention, in particular, relates to finishing hair side of fur and may be utilized to restore consumer's properties of fur articles. Dyeing of fur is carried out in dye bath containing (i) dissolved in isopropyl alcohol, acid dye taken in amount 1.3-1.5 g/L, while amount of isopropyl alcohol constitutes 4-6% of the volume of dye bath; (ii) tetrachloroethylene at liquid coefficient 20-25; and cationic surfactant in amount 1.0-1.5 g/L, followed by addition of formic acid in amount 40-50% of the weight of dye and conducting dyeing at 50-55°C for 2.0-2.5 h, after which fur is washed with tetrachloroethylene and then solvents from dye and washing bathes are regenerated. Method also enables restoration of consumer's properties of fur articles after dry-cleaning due to insignificant shrinkage of leather tissue.

EFFECT: improved environmental condition due to increased efficiency regeneration of solvents and reduced amount non-utilizable toxic wastes with properties of dyed fur preserved.

3 tbl, 25 ex

FIELD: fur industry, in particular, equipment for application of pattern and coloring of fur.

SUBSTANCE: apparatus has frame and support for accommodation of article, drive and driven shafts mounted on frame and on supports and equipped with sprockets for receiving thereon of two chain contours and drive sprocket on one of shafts, said drive sprocket being kinematically connected to step engine. Pipes of different lengths are attached to lower part of frame, said pipes being made in the form of multiple-row comb. Pipes are arranged in each comb row as their length is reducing and are positioned so that their angles of inclination relative to direction of advancement of article to be colored may be adjusted so as to reach intersection of sprays of atomized colorant with one another. Nozzles are fixed at the ends of each pipe. Depending on length and thickness of fur hair, depth of deepening of comb and distance between comb rows may be adjusted. Main pipes positioned between reservoirs filled with colorants are extending through colorant blowing device to which control unit is connected. Colorant is dosed and distributed through pipes by means of slide valves mounted on mains which may switch set of reservoirs filled with colorants to pipes for producing of multicolor image on surface.

EFFECT: increased efficiency by computerized, quick and high-quality shadeless coloring of fur, as well as application of compound multicolor patterns.

4 cl, 4 dwg

FIELD: personal use articles.

SUBSTANCE: method is described for dyeing of semi-finished fur article by dispersed dyes, including its treatment with dye in liquid medium, such as carbon dioxide in supercritical condition, produced in tight chamber at the pressure of 150-200 atmospheres and temperature of 40-60C, where semi-finished fur article is placed in advance, as well as dye in amount of 0.2-0.25% of weight of treated semi-finished article. Duration of treatment is 50-60 minutes.

EFFECT: method makes it possible to eliminate preparatory processes of retanning and neutralisation, aqueous medium of treatment, drying of semi-finished fur article, using auxiliary materials and acids, reduces technological processes, provides for more sparing treatment.

1 tbl, 1 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

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

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