INFLUENCE ESTERS ONTO PROPERTIES COLLAGEN CUTANEOUS COVERING

M.B.Shamsieva, T.J.Kodirov, N.A.Sodikov

TASHKENT INSTITUTE OF TEXTILE AND LIGHT INDUSTRY

Abstract

Synthesized esters of fatty acids distilled cotton soap stock and fusel oil. Identified water sorption properties of the original and processed collagen ester. It was found that the reaction of the ester with the active groups of collagen are formed strong chemical bonds.

Keywords: fatliquoring, ester, sorption, collagen.

Fat liquoring is one of the main processes of tanning manufacture, whereby changing the physical and mechanical properties of the skin (strength, elongation, water permeability, and others.) And maintain performance over a product.

Skin greasing fat composition different consistence or aqueous emulsions of fats. Composition Body composition and amount administered to the skin, as well as methods defined fatliquoring views manufactured designated purpose skin and its purpose.

The fat composition consists at any rate vast majority of natural fats and oils, synthetic fatty materials, and esterification products of fatty acid.

To expand the range of fatliquoring materials for processing natural leather, the authors [1] developed a new material fatliquoring. The starting material was used emulate, a mixture of esters of oleic, linoleic and linolenic acids, as well as rosin acids, and others. Emulate subjected to ethoxylation. The process introduced in the autoclave at a temperature and pressure 130-140 ⁰С 2 atm. Based on the processing of new material obtained fatliquoring leather with improved physical and chemical indicators and pleasant to the touch neck.

Proposed [2] materials based on derivatives of esters for the fatliquoring of leather, which are obtained by reaction of esters with alcohols based С_8-72 and OH - groups except glycerol or alkanediols with С_2-18 dimers or fatty alcohols and monocarboxylic acids with C_8-72 fatty acids with polyethylene glycol С_8-24. Sulfitated primary products obtained by reaction with concentrated sulfuric acid or diluted air with gaseous sulfur trioxide or a combination of an organic sulfonic sulfuric acid.

Therefore, researches on the development and application on the basis of a new series of ester fatliquoring compositions which can be used for all kinds of fatliquoring leather.

In accordance with the objective of the study conducted by analysis of the products of organic synthesis industry has shown that the bases for fattening materials are: Distilled fatty acids cotton soap stock and fusel oil. To study different molar ratios selected distilled fatty acids, such as oleic acid, isoamyl alcohol, to vary the temperature and time of the reaction, the catalyst and the yield of the ester.

The resulting ester is a homogeneous pasty appearance, and odor, dark brown color, density = 0.878, insoluble in water, easily soluble in most organic solvents with boiling point = 117^oС. The main part of the ester consists of saturated, 66.25% and 33.75% of unsaturated compounds.

As the range of fatliquoring materials and compositions proposed for use in the production of skins for different purposes, increases the need for development of reliable methods for assessing their plasticizing capability. In connection with this, sorption studies were carried out with collagen ester.

Sorption studies were performed on a high-vacuum apparatus with mercury closures and quartz weights Mc Ben and BET. The measurements were performed at 25 °C and the residual air pressure 10-3-10-4 Pa.

Fig. Sorption of water vapor collagen sample (1) and introduced into collagen ester (2-6), 25 °C temperature.

For an accurate assessment of the size and distribution of pores conducted regression analysis for each sample and plot were calculated and the value of the sum of squared residuals, variance, the variance of the adequacy and standard deviation, respectively.

Upon initial degassing only is removed physically adsorbed water. In this regard, physical isotherm curve is adsorption water to completely hydroxyl Ted sample [3].

The adsorption of water on the fully hydroxyl Ted surface samples is mainly physical, although it forms a hydrogen bond; at low pressures it is entirely reversible.

According to the theory of Brinier, Emmett and Teller (BET) can assume the following conclusions: in the adsorbent surface has a certain number of equivalent in energy terms of active sites; each molecule of the previous layer is an active center for the next adsorption of molecules adsorbed layer; reacting the adsorbed molecules adjacent to the first and last layers are absent; may all molecules in the second and more distant layers behave like molecules of the liquid.

The studies found that the reaction of the ester functional groups in the collagen are formed mainly hydrogen bonds. As a result, it is partially deposited between the fibers, and connects to the material of leather. Oiling is usually subjected to wet skin, because in this state of leather fiber insulated water, more mobile and better able to absorb the fat. In fat wet skin it penetrates more slowly than in the dry, but it is distributed more evenly between the fibers. The surface fibers enveloped in a film of fat which separates them and thus prevents bonding upon evaporation of water during drying skins. Due to this, after drying the skin remains flexible and elastic.

Introduction ester fatliquoring composition allows obtaining a homogeneous mixture fatliquoring which increase the viscosity grease mixtures. And also allows components to communicate securely with the fibers of the dermis, the skin and provides a high-strength property.

References:

1. LV Slobodskiy 03.09-12V. 128. The synthesis of new materials fattening. M., ed Ros-ZITLP. 2002, p. 13. Table. 1 Eng. Abstract Journal. 2002. -№9. - P.14.

2. Ya Pustylnik. 2B 174 P. fatliquoring materials. Verwendung von Esterderivaten zur fettenden Ausrustung von Leder: Request 19506099 Germany, MCI C 14 C 9/00 / Shenker Gilbert; Henkel KG & A. -№ 195.06.099.7; Stated 02.22.95; Publ. 29/08/96 Abstract Journal. 1998. -№2. - P.15.

3. S. Greg K. Singh Adsorption. Specific surface area. Porosity. 2nd ed. Moscow "MIR" 1984.