Dependence of the physical and mechanical properties of eco - leather on the conditions for the formation of a polymer coating

Polyurethane - coated fabrics (eco - leather) have become a popular material for the production of clothing and haberdashery. The authors have developed and implemented a technology for applying a polyurethane coating on a woven base at Baranovichi Cotton Production Association. The difference between the newly developed technology for the production of eco - leather and the existing ones is the use of a foamed polyurethane composition. The aim of the work is to determine the dependence of the physical and mechanical properties of eco - leather on the conditions for the formation of a polymer coating (foam ratio and drying time). To achieve these goals, prototypes of polyurethane - coated fabrics were prepared. The experiment was carried out using the Kono matrix with two repetitions of each series of experiments. With an increase in the expansion ratio of the foam from β = 1.25 to β = 1.75, the volume of liquid in it decreases, which leads to a decrease in the rigidity of the finished material, thus it improves its vapor and air permeability. It is advisable to use high - viscosity polyurethane compositions (β= 1.75), since low - viscosity ones (β = 1.25) penetrate too deeply into the structure of the woven base, while giving the coated materials increased rigidity. With a drying time of 10 minutes and a multiplicity of β = 1.75, the resistance of the eco - leather polymer layer to abrasion decreases. The obtained dependences must be taken into account in the future in the production of polyurethane - coated fabrics, depending on the area of their application and customer requirements.