Method for the production of leather

 

(57) Abstract:

The method applies to leather production, in particular for finishing operations, specifically to the content, for the manufacture of elastic chrome-tanned leather for Shoe uppers from raw cattle. The method of manufacturing includes leather retanning chrome tanning agent, neutralization, dyeing and filling in an aqueous solution of the chemical. As a chemical reagent for use filling the copolymer diallyldimethylammoniumchloride with maleic acid. The number of chemical filling is chosen in the range of 4-8% by weight of semi-finished product. Time filling process is chosen in the range from 45-90 minutes the temperature of the filling process is chosen in the range 30-65C. the Product for filling copolymer of diallyldimethylammonium chloride with maleic acid was named "UTIS-1". The method allows to achieve high physical-mechanical properties of the skin without appreciation of the filler and the complexity of the process. 3 C. p. F.-ly, 1 table.

The invention relates to leather production, in particular for finishing operations, specifically to the content, for the manufacture of elastic chrome-tanned leather for Shoe uppers from raw cattle.

the group greasing and filling.

The main purpose of the filling of semi-finished leather chrome tanning is the alignment of the thickness and density of the skin topography of the land, getting the skin with a dense outer layer. Using the operation of filling eliminates defects such as uneven density and thickness of pelt, insufficient thickness, friability, etc.

Known use in the production of leather imported filler "Relugan RE" [1] . Physical-mechanical properties of the skin, produced with the use of this filler, meet the highest requirements. However, import filler inaccessible and roads.

The closest to the technical nature of the claimed is a method of production of the skin, which as a filler in finishing operations are applied aqueous dispersion of polymers. In domestic production has been widely used filler MH-30 is the product of copolymerization of chloroprene and methyl methacrylate [2]. Despite the relatively low price and availability of this filler prototype method has a number of disadvantages which result in skin developed with its use, have low values of strength (tensile idaca, which directed the claimed technical solution is to eliminate these disadvantages, namely the development of a method of manufacture of the skin, allowing the filling stage to achieve high physical-mechanical properties of the obtained skin without appreciation of the filler and the complexity of the process.

The problem is solved by the method of dressing the skin, including retanning chrome tanning agent, neutralization, dyeing and filling in an aqueous solution of the chemical, which, unlike the prototype, as a chemical reagent for use filling the copolymer of diallyldimethylammonium chloride with maleic acid. The problem is solved in that the amount of chemical to fill is selected in the range of 4-8% by weight of semi-finished product.

The problem is solved in that the filling process is chosen in the range from 45 - 90 minutes.

In addition, to solve the task, the temperature of the filling process is selected in the range 30-65oC.

Because one of the developers of the proposed method is Ufa technological Institute of service (UTIS), chemical reagent for filling copolymer of diallyldimethylammonium chlorides get in a known manner by radical copolymerization in solution, described in [4]. According to a known method for obtaining the copolymerization is carried out in aqueous medium in the presence of a radical initiator of the type selected from the recommended number: DINITROL asuitable acid, persulfates, peroxides. Experiments have shown that the most preferred is potassium persulfate. The specific parameters of the process of copolymerization (total concentration of monomers, initiator, temperature) are within the recommended range. Experimentally the most preferred values of the parameters from the point of view of application of this copolymer in the manufacture of leather. These data are the know-how of the applicants. The parent compound, diallyldimethylammonium chloride and maleic acid, are available and can be produced on an industrial scale. A method of producing a filler UTIS - 1 simple and does not require special equipment.

The inventive method is implemented as follows. After the process of tanning by the standard technology semi-finished product is subjected to slicing, washing, doublepane chrome tanning agent, neutralization, dyeing and filling. The drum load an aqueous solution of a copolymer of diallyldimethylammonium chloride with Malinovo the tion), after that, the treated skin was washed with running water and dried. The filling process can be combined with other finishing operations - greasing and dyeing.

A specific example of implementation of the method. The tests were carried out in pilot plant Sterlitamak leather and Shoe factory. The drum capacity of 5000 l load sliced cake mix in the amount of 450 kg and forth through the hollow shaft of the drum download 1782 l of an aqueous solution of a copolymer of diallyldimethylammonium chloride with maleic acid. The temperature of holding the filling is selected depending on, whether the combined process of filling with dyeing or not. The dyeing process is at a temperature of 60-65oC. In the case of combining processes the temperature of the filler can also be 60-65oC. (When using filler MX-30 had to artificially lower the temperature after dyeing, to 35-40oC by adding cold water. This worsened the quality of the leather, because it caused them to shrink). We offer the filler is well-established when high process temperatures (temperatures dyeing), no sediment is mixed with tanning with chromium compounds, fats and dyes. Issia with domestic filler - MX-30 and import Relugan RE (at the same flow rate of each filler). The results are given in the table.

The amount of filler UTIS - 1 relative to the weight of shaved leather is from 4 to 8% (calculated on the dry matter), chosen experimentally and depends mainly on the quality of the feedstock. So when making leather from the hides of cattle increased weighing is used, the upper limit of the specified range. The decrease in the amount of filler is less than 4% leads to a decrease in the quality of the front surface, the uniformity of the skin, i.e., prevents the achievement of the objectives of the invention. Increasing the amount of filler over 8% is impractical because it does not lead to noticeable improvement in quality.

During the filling process also chosen experimentally and varies from 45 to 90 minutes. During the filling process also affects the quality of the feedstock, the amount of filler and the temperature of the process.

The temperature holding process of filling selected from the following considerations. The process of filling in the method prototype was carried out at a temperature of 35 - 40oC. In the same temperature range effective is rasenia, the higher the temperature of the dyeing solution (typically 60 - 65oC) you can use the temperature of the filler UTIS - 1 this temperature, since no adverse effects were higher than the reference temperature on the quality of the filler is not detected. Thus, the allowable temperature range is from 30 to 65oC. Further increase in temperature is impractical, because it increases the energy consumption of the process without improving the quality of the resulting product.

The inventive method allows increased cost and complexity of the technological process to achieve quality leather the same as that achieved using expensive and inaccessible import filler. By combining the processes of fatliquoring, dyeing and filling formed a significant economic effect resulting from the reduction of labor intensity, energy intensity and increase the load factor of the technological equipment. All these advantages make the inventive method, based on the application of the new filler UTIS - 1 (copolymer of diallyldimethylammonium chloride with maleic acid), attractive for domestic production, as well as alizatio, dyeing and filling in an aqueous solution of a chemical reagent, characterized in that as a chemical reagent for use filling the copolymer diallyldimethylammonium chloride with maleic acid.

2. The method according to p. 1, characterized in that the amount of chemical to fill choose within 4 to 8% by weight of semi-finished product.

3. The method according to PP.1 and 2, characterized in that the filling process is chosen in the range of 45 - 90 minutes

4. The method according to PP.1 to 3, characterized in that the temperature of the filling process is chosen in the range of 30 - 65oC.

 

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Method of finishing // 2127763

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: tannery or furry production.

SUBSTANCE: the invention is pertaining to the field of tannery or furry production and may be used for a piece by piece treatment of a tanning, furry semi-finished product with emulsions of "water in oil" type. The device for impregnation of sheets contains a mounted on the frame bath with a working compound, in which a corrugated roller is dipped, and also a feeding and auxiliary conveyers and a smoothing roller, a supporting means with a resilient counterbody, an actuator, a tool for removal of a finished semi-product, a device for creation of a hydrodynamic wedge and a pinch roller for engagement of the ribbed roller with the feeding conveyor. The problem of the presented invention is - development of the device simple in its servicing with a high reliability allowing to realize the process of impregnation more efficiently with a possibility of its installation in an automatic production line.

EFFECT: the invention presents a device simple in its servicing, having a high reliability, more efficient realization of the process of impregnation, a possibility of its usage in an automatic production line.

2 dwg

FIELD: tannery industry.

SUBSTANCE: claimed method includes treatment of chrome-tanned semi-finished product with antiseptic such as polymineral obtained from natural non-metal fossils (minerol), which is used in amount of 5-10 mass % based on semi-finished product. Minerol is also used as filler being introduced in retanning step with chrome compounds in amount of 5-10 mass % based on semi-finished product.

EFFECT: effective biological leather conservation after chrome tanning.

3 cl, 1 tbl

FIELD: chemical technology.

SUBSTANCE: invention relates to greasing and emulsifying substances used in fur, leather and other branches of industry. Invention describes a method for deep sulfonation of oxidized vegetable oils, fats and their mixtures, and oxidized mixtures with the nominal viscosity value in the range 33-75 by viscosimeter VZ-4 at 20°C in their treatment with sodium sulfite. The process is carried out in system consisting of oxidized component or mixture of oxidized components, sodium sulfite, water and soap additives, carboxylic acid, phenol and copper (II) salt as a catalyst in bead mill of vertical type at temperature of environment up to practically complete ceasing or quantitative consumption of sodium sulfite and charge of the latter is calculated by the following formula: mNA2SO3 = 0.006 x mOX x (I.N.)OX wherein mOX and (I.N.)OX mean mass and iodine number of oxidized component or mixture of oxidized components, respectively. The mass ratio of oxidized component and water varies in the range from 1:4 to 1:2.5. Dosing additives with respect to oxidized component are following: soap, 2%; carboxylic acid, 4%; phenol, 2.5%. Oxidized flax, sunflower, soybean and cotton oils, oxidized fish oil and mixtures of vegetable oils with fish oil or pig fat are subjected for sulfonation reaction with air in regimen of intensive bubble bubbling at 105 ± 5°. Soaps in indicated system are represented by sodium stearate and sodium oleate and by reaction mixtures of practically quantitative alkaline hydrolysis of fats and vegetable oils also. Benzoic, oxalic, malonic and citric acids are used as acid, and sulfate, acetate and other water-soluble salts of copper (II) are sued as a catalyst dosed in the amount (2-7.5) x 10-4 mole/kg of the parent charge. The sulfonation reaction degree is 33-40%.

EFFECT: improved preparing method.

5 cl, 1 tbl, 16 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: 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: chemistry of polymers, chemical technology.

SUBSTANCE: invention relates to copolymers consisting of monomers comprising acid groups with double bond and other hydrophobic monomeric component used in prophylaxis of inorganic and organic deposits in water-bearing systems. Invention describes a water-soluble copolymer comprising: (a) monoethylene-unsaturated monomers chosen from group consisting of monocarboxylic acids, dicarboxylic acids and sulfoacids that can be neutralized; (b) at least copolymerizable hydrophobic acrylic, monocyclic and/or bicyclic terpene comprising unsaturated double bond wherein terpene hydrocarbon is preferable, and copolymer is prepared by free-radical copolymerization of components (a) and (b) in an aqueous phase. Also, invention describes a method for synthesis of abovementioned copolymer and methods for its using. Invention provides synthesis of nontoxic copolymer used for prevention of deposits in water-bearing systems that can be easily prepared from available components and able to store for a long time without loss of activity.

EFFECT: improved preparing method, valuable properties of copolymers.

22 cl, 6 tbl, 6 ex

FIELD: individual and household supplies.

SUBSTANCE: processing method for natural leather uppers after stretching and lasting operations involves high-frequency low-temperature unbalanced plasma effect in vacuum chamber with plasma generation air flow rate of 0.04-0.06 g/second for 180-280 seconds at 13-26 Pa pressure with discharge power of 0.7-2.0 kW.

EFFECT: enhanced shoe shape stability and adhesion durability in the wearing process.

1 dwg, 1 tbl

FIELD: chemistry.

SUBSTANCE: modified leather is meant for making internal components of shoes with good biocidal properties and relates to light industry. The modified leather includes a collagenic base with a multilayer structure, tanning, retan, oiling compounds and a biocidal additive, the later being in form of silver nanoparticles and alkyldimethylbenzyl ammonium chloride in ratio of 1-:-0-1.5 respectively. Content of silver nanoparticles is 710-5 - 6.410-3 wt %.

EFFECT: wide range of lining leather while cutting on number of biocidal agents used on the leather and stabilisation of deformation-strength characteristics of the leather during its use, as well as improved environmental friendliness of the process of manufacturing said leather.

2 tbl

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