INFLUENCE OF ORGANIC CONTENT FIBROUS ADDITIVES OF NATURAL AND SYNTHETIC ORIGIN ON THE PROPERTIES OF EPOXY PROTECTIVE COATINGS
Abstract
To form polymer coatings, an ED-20 brand epoxy binder was used, which was polymerized with PEPA polyethylene polyamine hardener in the ratio: ED-20 epoxy oligomer – 100 parts by weight, PEPA hardener – 10 parts by weight. To increase the physical, mechanical and thermophysical properties, a mixture of discrete organic fibers of natural and synthetic origin was used with a content of q = 0.25...2.00 parts. The paper compares the results of the study of physical and mechanical properties and analysis of the fracture surface of reinforced polymer materials. It is shown that the maximum value of physical and mechanical properties (W = 12.8 kJ/m2, σst = 90.0 MPa, E = 3.7 GPa) is characterized by materials containing a mixture of discrete fibers of organic origin based on polyester (75 %), viscose (23 %), elastane (2 %) with a content of q = 0.75 parts. Such composites are characterized by a viscous, homogeneous destruction of the surface of the material. Comprehensive studies of thermophysical properties of reinforced composite materials have been conducted. It was established that epoxy composites filled with a mixture of discrete fibers of organic origin based on cotton (52 %) and polyester (48 %) with a content of q = 0.75 parts are characterized by improved indicators of thermophysical properties. Such composites are characterized by the following properties: heat resistance according to Martens – Т = 347 K, glass transition temperature – Тс = 332.5 K, thermal coefficient of linear expansion in the temperature range ΔТ = 303…323 K is – α = 1.6 × 10-5 K-1. The dynamics of changes in the thermal coefficient of linear expansion in the temperature range ΔТ = 303...423 K were established. The obtained materials are characterized by the lowest value of the thermal coefficient of linear expansion and the maximum value of heat resistance – Т = 347 K and glass transition temperature – Тс = 332,5 K, which is related with the chemical activity of natural components.
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