Leather finishing process

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.

 

The invention relates to the leather industry and can be used for finishing of chrome leather.

There is a method of finishing by applying a fixing composition and subsequent exposure to radiation by accelerated electrons dose 8-8,5 Gr (see, for example, A.S. 1234434).

The disadvantage of this method is a slight increase adhesion of the coating to wet the skin.

The closest in technical essence and the achieved result is a way of finishing chrome-tanned leather, which before applying the first coat coating paint the skin is exposed to low-temperature nonequilibrium plasma of high-frequency discharge in a vacuum chamber within 300-600 C. Exposure is carried out at a pressure in the chamber 53,3-80 PA and the flow rate of plasma-generating air-0.04-0.06 g/S. the strength of the current at the anode generator lamp 0,2-0,6 A. Then perform successive application of several layers of coating paint on the skin (see, for example, patent RU No. 2127763. Bull. No. 8, 20.03.99, IPC6SS 9/00, 11/00).

The disadvantage of this method are the low adhesion and strength properties of the skin.

The objective of the invention is to improve the adhesion stability of the surface chrome-tanned leather, the increasing strength of the skin and improving its quality.

This object is achieved in that a method of finishing of chrome leather includes a paragraph is coherent application of all layers of the coating when exposed to low-temperature plasma with the power of current at the anode generator lamp of 0.2-0.6 And after applying all of the coating layers of the skin is exposed to low temperature plasma within 180-240 when the pressure in the discharge chamber 13,3-to 26.6 PA and the flow rate of plasma gas is argon or 0.035-0.04 g/S.

The skin is introduced into the plasma of high-frequency discharge, relative to the plasma acquires a negative charge. From opposite sides of the plate in turn creates a layer of positive charge. At each point in time, the charges of opposite sides of the plate are different from each other. And because the processed material - leather refers to the dielectric, the layer of positive charge - skin - layer positive charge can be considered as a capacitor. Therefore, inside the skin, there is an electric field intensity sufficient to breakdown the gas located in the micropores.

The greatest contribution to the modification of the external surface make three processes: recombination of ions and the transfer of energy purchased in the surface charge layer at the surface of solids, thermal effect, and modification "in the volume" - recombination of ions and thermal effect. The density of heat flow rate does not exceed 8·103W/m2and the energy of the ions bombarding the surface, up to 90 eV. Modification is not only the surface layers on the geometric border, but throughout the volume of the skin.

After exposure to low temperature plasma is changing the fibrous structure of the dermis. The increase in ordering of the amorphous phase and the increase in the percentage of the crystalline phase increases the strength of the skin, but the skin does not become rigid, because in parallel with the process of the hardening process flows razvlechenija, which decreases the compactness weaves structural elements of the skin, increasing their mobility and ability to move under the influence of the bending forces. The increase in the contact surface due to the splitting of the fibers and the porosity of the skin leads to increased adhesion of the coating to the skin.

The method is carried out by high-frequency plasma installation. Installation (drawing) includes a gas supply system (1), vacuum chamber (2), the electrodes (3), the pumping system (4), the vacuum unit (5), the discharge chamber (6), cooling system (7), high frequency (HF) generator (8), vacuum piping (9).

The method is as follows.

In a vacuum chamber (2) skin samples are placed in the gap between parallel vertically spaced electrodes (3) along the flow of plasma gas. Pre-pumping of air from the vacuum chamber (2). In a vacuum chamber (2) nauseosa working gas. Adjustment of the valve, which is coumou chamber (2) to the pumping system (4), set point pressure. When applying to the electrodes (3) the RF voltage in a discharge chamber (6) by heating of the plasma gas to a plasma formed by the plasma stream - processing tool.

Mode plasma processing is controlled by changing the plasma gas flow a 0.035-0.04 g/s, the current on the generator lamp 0,2-0,6 A, the pressure in the discharge chamber 13,3-to 26.6 PA, exposure time, plasma 180-240 C. as a plasma-forming gas used argon.

The research results of the proposed method of finishing of chrome leather and indicators of physical and mechanical properties are shown in table 1. Analysis of the data presented in the table shows that the method of finishing of chrome leather due to the impact of low-temperature plasma after coating will improve the adhesion, the stability of the coating, the durability of chrome leather and improve its quality. The optimal mode for finishing chrome-tanned leather is the impact for 180-240 seconds, when the pressure in the discharge chamber 13,3-to 26.6 PA, the flow rate of argon plasma a 0.035-0.04 g/S. the Method of finishing outside the boundaries of these values leads to the degradation of physical and mechanical properties.

Table 1
The operating modesDisplay the spruce physico-mechanical properties
The coating adhesion, N/mThe depth of penetration of the dye, mcmThe stability of the coating

the number of bends
The breaking load

tensile 10 MPa
to dry skinto wet skin
The placeholder341,3170,31733900021,6
The time of exposure to plasma,
150600,8193,82184100023,1
180920,0230,02404500024,5
240850,5210,72224200023,7
300540,2187,12134000022,8
The gas flow rate, g/s
0,03720,8198,32204100023,8
0,035910,2228,82384400024,3
0,04880,7223,92414500024,8
0,06450,5183,62113900022,9
The chamber pressure, PA
10,0680,7188,12214200023,3
13,3900,8231,22394400024,6
26,6890,1221,92294300023,9
50,0320,9181,42123900022,5

The adhesion of the coating is determined according to GOST 939-88, note 6 "Method of determining the adhesion of the emulsion and microemulsion coating to the skin."

The depth of penetration of the dye was determined by scanning electron microscope SET-202M in the laboratory methods of the workshop on the chemistry and technology of leather and fur authors Have, Dagoreti, Lublanka. M: Legprombytizdat, 1987, str-258.

Breaking load tensile determined according to GOST 938.11-69.

The stability of the coating on the skin to repeated bending is determined according to GOST 138-6.

The advantages of this method compared with the prototype is to increase coating adhesion to dry and wet skin, the depth of penetration of the dye, the increase in the resistance of coatings to repeated bending, strength and quality of the skin.

Method of finishing, including consistent application of all layers of the coating when exposed to low-temperature plasma with the power of current at the anode generator lamp 0,2-0,6 A, characterized in that after deposition of all layers of coating the skin is exposed to low temperature plasma within 180-240 when the pressure in the discharge chamber 13,3-to 26.6 PA and the flow rate of plasma gas is argon or 0.035-0.04 g/S.



 

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