RU2383626C1 - Modified leather for lining shoes - Google Patents

Abstract

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 7×10^-5 - 6.4×10^-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.

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Description

The invention relates to light industry, in particular to shoe production, and can be used for the manufacture of internal parts of shoes with high biocidal properties.

The internal parts of the shoe during operation experience a special effect associated with perspiration of the human foot and the activity of microorganisms that multiply in this environment.

Known materials based on natural compounds, which in the process of special processing are given biocidal properties. For example, a textile material in the form of a mesh structure containing a bactericidal preparation of catami n AB with a flow rate of 0.5-1.5% by weight of the material (RU 2159825, class D04H 1/44, op. 2000).

An important place in the production of lining materials is occupied by genuine leather with antibacterial, fungicidal and other biocidal properties. The introduction of biocidal preparations is carried out at different stages of skin production.

Known skin impregnated with an antifungal and antibacterial agent, which is used as the salt of lanthanum or cesium in an amount of 0.02-1.25% by weight of the raw material in terms of metal oxide (RU 2052507, class C14C 9/00, op. 1996) .

Known skin containing substituted amines as a biocidal preparation (RU 2151193, class C14C 9/00, op. 2000).

Lining leather is also known, including tanning, fatliquoring components, and methyl esters of Z-3-benzenesulfonyl and / or Z-3- (2-naphthalenesulfonyl) -propenoic acid in an amount of 0.5-1.0% by weight as an antiseptic semi-finished product (SU 1654340, class C14C 9/00, op. 1991).

The disadvantage of these materials is the high consumption of antimicrobial agents, the adverse effect of the used chemical compounds on the environment and a narrow spectrum of biocidal action.

The technical result of the invention is the expansion of the range of lining leathers while reducing the number of biocidal preparations introduced into the skin, and stabilizing the deformation-strength properties of leathers during its operation while increasing the environmental friendliness of the process for producing this skin.

This technical result is achieved by the proposed modified leather for shoe lining, including a collagen base of a multilevel structural organization, tanning, retanning and fatliquoring compounds and a biocidal additive in the form of nanosized particles of silver and alkyl dimethylbenzylammonium chloride in a ratio of 1: 0-1.5, respectively, while the content of nanosized silver particles is 7 × 10 ^-5 -6.4 × 10 ^-3 wt.%.

Modified skin is prepared as follows: a leather tanning product of chrome tanning intended for shoe lining, after fatliquoring and washing, is sequentially treated in an aqueous medium with a liquid coefficient of 2 nanosized particles of silver and alkyldimethylbenzylammonium chloride at a temperature of 30 ° C for 10 minutes, while the concentration of the aqueous dispersion silver nanoparticles and a solution of alkyldimethylbenzylammonium chloride are 0.03-0.06 and 0-0.09 g / l, respectively. After spinning and squeezing, the semi-finished product is dried in a free state to a moisture content of 10-16% in accordance with the methodology for the production of leather for shoe lining. Table 1 presents the indicators characterizing the skin in two treatment options.

1st var. An aqueous dispersion of nanosized silver particles was used as a bactericidal additive.

2nd var. As a biocidal additive, a composition comprising an aqueous dispersion of nanosized silver particles and a solution of alkyldimethylbenzylammonium chloride.

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

Moisture 12-16 Golovy substance 65-70 Compounds of chromium, in terms of on chromium oxide, not less 4.3 Substances extracted with CCl ₄ 7-10 Alkyldimethylbenzylammonium chloride 0-0.009 Ag ⁺ electrochemically active 7 × 10 ^-5 -6.4 × 10 ^-3

Nanosized silver particles in the finished skin are determined by the content of electrochemically active Ag ⁺ by accumulation inversion voltammetry.

Bacterial strains of Escherichia coli and Staphylococcus aureus were used to evaluate the biocidal properties of the skin. Daily test cultures of bacteria were applied at the rate of 10 ⁴ CFU per 1 cm ² of skin area, after which the samples were incubated and studies were carried out in accordance with the standard method

Table 1 Indicator Option 1 Option 2 Control (prototype) Moisture% 12 16 16 Goal stuff,% 65 70 58.5 Chromium oxide,%, 4.3 4.4 4,5 Extractable substances,% 7 10 16 Alkyldimethylbenzylammonium chloride,% 0 0.0096 - Ag ⁺ ,% 0.00007 0.0064 - Biocidal preparation (prototype),% 0.4-1.0 The content of test cultures S.aureus lack of growth lack of growth 200 The content of test cultures of E. coli lack of growth lack of growth one hundred

The results of the growth of microorganisms were taken into account on the 2nd day and determined in CFU per 1 cm ² .

The insoles made from the obtained leather were subjected to experimental wear for 1 month.

Table 2 shows the indicators of deformation-strength properties characterizing the achieved effect.

table 2 Indicators GOST 940-81 Leather obtained by var. 1 Var. 2 Leather Prototype Leather Original skin In the product after wear Ref. leather In the product after wear Ref. leather In the product after wear Tensile Strength, MPa Not less than 12 fifteen 16 16 17 12 10 Elongation at a voltage of 10 MPa,% 15-40 25 22 thirty 27 17 fourteen

The presented results indicate that skin samples modified with silver nanoparticles and alkyldimethylbenzylammonium chloride have the necessary and sufficient spectrum of biocidal activity with a significantly lower residual content of biocidal preparations in the finished skin, and also retain strength properties during operation.

Claims (1)

Modified leather for shoe lining, including a collagen base of a multilevel structural organization, tanning, retanning and fatliquoring compounds and a biocidal additive in the form of nanosized silver particles and alkyl dimethylbenzylammonium chloride in a ratio of 1: 0-1.5, respectively, while the content of nanosized silver particles is 7 · 10 ^-5 -6.4 · 10 ^-3 wt.%.