Development of epoxy-polyester base modified with UV light for upgrading of technological equipment of vehicles
Keywords:epoxy-polyester composite, flexural modulus, heat resistance (according to Martens), ultraviolet irradiation.
The paper studies the physical and mechanical properties, heat resistance of an epoxy-polyester composite material with the addition of methylene diphenyl diisocyanate modifier. The effect of ultraviolet radiation sources with wavelengths of 254 nm and 365 nm for different duration of treatment has been analyzed. It is found that the material that is exposed to ultraviolet irradiation for τ = 5 min at an irradiation wavelength of 365 nm is characterized by the optimal indicators of physical and mechanical properties.
The developed epoxy-polyester matrix is characterized by the following indicators of the properties under study: heat resistance (according to Martens) T = 354 K, breaking stresses during bending b = 57.0 MPa, elastic modulus E = 3.7 GPa, impact strength W' = 12.6 kJ/m2. For materials that have been treated with ultraviolet irradiation with a wavelength of 254 nm, the maximum values were obtained for the duration of treatment τ = 20 min. At the same time, there have been found low indicators of combined heat resistance, physical and mechanical properties in comparison with the composite treated with ultraviolet irradiation (365 nm): heat resistance (according to Martens) T = 350 K, breaking stresses during bending b = 62.0 MPa, modulus of elasticity E = 3.5 GPa, impact strength W'= 11.8 kJ/m2.
Additionally, the fracture surfaces of the developed materials were analyzed before and after preliminary treatment of the compositions with ultraviolet irradiation using optical microscopy. There have been revealed differences in the nature of the epoxy-polyester matrix fracture to irradiation and the matrix modified by ultraviolet light. It has been confirmed that the optimal conditions for ultraviolet irradiation of the studied composite material at a radiation wavelength of 254 nm is τ = 20 min; at a radiation wavelength of 365 nm τ = 5 min.
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