Modified leather for lining shoes

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

 

The invention relates to light industry, in particular to a Shoe production, and can be used for manufacturing the inner parts of the Shoe with enhanced biocidal properties.

The internal details of the shoes during operation have a particular impact associated with sweating of the feet of the person and activity of microorganisms that multiply in this environment.

Known materials based on natural compounds, which process special treatment given biocidal properties. For example, the textile material in the form of a mesh structure comprising a bactericidal drug kata h AB with a flow rate of 0.5 to 1.5% by weight of material (EN 2159825, CL D04H 1/44, op).

An important place in the production of lining material is genuine leather with antibacterial, antifungal and other biocidal properties. The introduction of biocidal products perform in different stages of production of the skin.

Known skin soaked antifungal and antibacterial agent, which is used as the salt of lanthanum or cesium in the amount of 0.02-1.25% from the mass of raw material in terms of the oxide of the metal (RU 2052507, CL SS 9/00, op. 1996).

Known for the skin, containing a biocidal preparation of substituted amines (EN 2151193, CL SS 9/00, op. 2000).

Also known lining leather, including tanning, oiling components the options and as an antiseptic additives - methyl esters of Z-3-benzazolyl and/or Z-3-(2-naphthalenesulfonyl)-propanolol acid in quantities of 0.5-1.0% by weight of semi-finished product (SU 1654340, CL SS 9/00, op. 1991).

The disadvantage of these materials is the high consumption of antimicrobial drugs, the adverse impact of used chemicals on the environment and the narrow range of biocidal action.

The technical result of the invention is the expansion of the range leather lining, while reducing the number of biocidal products, is injected into the skin, and stabilization of deformation-strength characteristics of the skin in the course of its operation during the greening process of the skin.

This technical result is achieved by the proposed modified leather for Shoe lining, including collagen based multilevel structural organization, tanning, doubleValue and greasing connection and biocidal additive in the form of nanoscale particles of silver and alkyldimethylbenzylammonium chloride in the ratio of 1:0-1,5, respectively, the content of silver nanoparticles is 710-5sphere-6,410-3wt.%.

The modified skin was obtained as follows: semi-finished leather, chrome tanned, intended for Shoe lining, after fatliquoring and washing sequentially about abayat in the aquatic environment when liquid factor of 2 nano-particles of silver and alkyldimethylbenzylammonium chloride at a temperature of 30C for 10 minutes, the concentration of the aqueous dispersions of silver nanoparticles and solution alkyldimethylbenzylammonium chloride is 0.03-0.06 0-0,09 g/l, respectively. After aging and spin-wiring the semi-finished product is dried in a free state to a moisture content of 10-16% in accordance with the method of production of leather for Shoe lining. Table 1 presents the indicators of skin two treatment options.

1st var. As bactericidal additives used aqueous dispersion of nanoscale silver particles

2nd var. As a biocidal additive composition comprising an aqueous dispersion of silver nanoparticles and the solution alkyldimethylbenzylammonium chloride.

Modified the skin characterized by the following composition, wt.%:

Moisture12-16
Golevoe substance65-70
Compounds of chromium, calculated
the chromium oxide is not less than4,3
Substances extracted CCl47-10
Alkyldimethylbenzylammonium chloride0-0,009
Hell+the electrochemically active710-5sphere-6,410-3

Nano-sized particles of silver in the skin determines the content of the electrochemically active Ag+by Stripping voltammetry method of accumulation.

For evaluation of biocidal properties of the skin were used strains of the bacteria Escherichia coli and Staphylococcus aureus. Daily test-culture of bacteria was applied at the rate of 104SOME 1 cm2the area of the skin, after which samples were incubated and conduct research in accordance with the standard method

Table 1
IndexOption 1Option 2Control (prototype)
Moisture, %121616
Golevoe prophetic, %657058,5
The chromium oxide, %,4,34,44,5
Substances extracted, %7 1016
Alkyldimethylbenzylammonium chloride, %00,0096-
Hell+, %0,000070,0064-
Biocidal product (prototype), %0,4-1,0
The content of the test cultures S.aureusthe lack of growththe lack of growth200
The content of the test cultures E. colithe lack of growththe lack of growth100

The light of the growth of microorganisms was carried out on the 2nd day and was determined as CFU per 1 cm2.

Made of leather removable insoles were subjected to the wear experienced during 1 month.

Table 2 shows the indices of deformation and strength properties that characterize the achieved effect.

Table 2
Indicators GOST 940-81The skin is obtained by varThe skin is obtained by varThe skin is obtained by prototype
Original leatherIn article after socksEx. leatherIn article after socksEx. leatherIn article after socks
Ultimate tensile strength, MPaNot less than 12151616171210
The elongation stress of 10 MPa, %15-40252230271714

The presented results indicate that the skin samples modified with silver nanoparticles and alkyldimethylbenzylammonium chloride, have the necessary and sufficient spectrum biocidal Akti the property at a much lower residual content of biocidal products in the finished leather, and retain mechanical properties during operation.

Modified leather for Shoe lining, including collagen based multilevel structural organization, tanning, doubleValue and greasing connection and biocidal additive in the form of nanoscale particles of silver and alkyldimethylbenzylammonium chloride in the ratio of 1:0-1,5, respectively, the content of silver nanoparticles is 710-5sphere-6,410-3wt.%.



 

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