ИССЛЕДОВАНИЕ ГИДРОФОБНОЙ ОБРАБОТКИ КОЖИ СРЕДНЕВЕКОВЫХ КНИЖНЫХ ПЕРЕПЛЕТОВ МЕТОДОМ ОКАНЧАТЕЛЬНОЙ ОТДЕЛКИ ПЛЕНКООБРАЗУЮЩИМИ И ВОДОСТОЙКИМИ МАТЕРИАЛАМИ
We have previously researched the effect of biocide products on the growth of several fungi-mycodestructors. We know that ancient leather bindings did not go through finishing phase or even if the leather did receive coating, then natural lubricating substances were used. That type of finishing could not provide enough water resistance to the leather. Water resistance of leather is determined by the following factors: a) By the water repellency of the surface of the leather, as well as fibers of the dermis and the layer of leather located near the front flesh side of a hide surface; b) By the fiber swelling (water quickly penetrates the leather, but the fibers as they swell, they fill the interstructural gaps of the dermis and the further absorption of water by the dermis stops). To reduce the water permeability of the leather, it is not enough to cover its fibers with a water-repellent film. This is explained by the fact that the hydrophobic leather will remain
water resistant only until it undergoes various deformations (bending, pressure). Despite this fact that book bindings rarely get bent, they are often subject to various deformations under pressure. This factor explains the development of technology for producing water resistant leather. Continuing the research on conservation and preservation of medieval leather bindings of The Matenadaran Museum, in order to expand the use of natural oils and their modifying agents, an attempt was made to improve the method of greasing with the help of fat-organic mixtures. For the final finishing of ancient leathers, various binders (resin) and hydrophobic interaction of the siloxane with the film-forming binder was studied as well. The latter, as a well-known hydrophobic film former, was tested for the final finishing of ancient leather and experiments showed that its use significantly increased the leather resistance to water.