Abstract
The prospective of the application of new materials on a polymer base is shown in this work. Given that developed composites can be efficiently used for protection of equipment that is operated at elevated temperatures, the impact of the nature and content of powder mixture, synthesised by high voltage electric discharge, on the thermophysical properties of epoxy composites were studied. Epoxy diane oligomer was chosen as the main component of the binder during the formation of the composites. Polyethylene polyamine hardener was used for cross-linking of epoxy composites, which allows hardening of materials at room temperatures. The selection of powder mixture, synthesised by high voltage electric discharge, for increase of thermophysical properties of developed materials was justified. More so, thermal stability and activation energy of epoxy composites were studied. Permissible limits of the temperature, at which developed materials can be used, were established based on the conducted tests of thermophysical properties of materials, filled by powder mixture, synthesised by high voltage electric discharge.
Highlights
The problem of ensuring the reliability of parts of technological equipment during their use in conditions under the impact of aggressive environments and sign-alternating or increased temperatures is an urgent scientific and technological problem
Given that developed composites can be efficiently used for protection of equipment that is operated at elevated temperatures, the impact of the nature and content of powder mixture, synthesised by high voltage electric discharge, on the thermophysical properties of epoxy composites were studied
Epoxy composites were formed by the following technology [4]: resin was heated up to the temperature of Т = 353 ± 2 К, at which it was held during a time of τ = 20 ± 0,1 min; oligomer and filler particles were hydrodynamically merged during the time of τ = 10 ± 0.1 min; composition underwent ultrasonic treatment (UST) during the time of τ = 1.5 ± 0.1 min; the composition was cooled to room temperature during the time of τ = 60 ± 5 min; the hardener was introduced and the composition was mixed during the time of τ = 5 ± 0.1 min
Summary
The problem of ensuring the reliability of parts of technological equipment during their use in conditions under the impact of aggressive environments and sign-alternating or increased temperatures is an urgent scientific and technological problem. The use of polymer composite and protective coatings, based on them, is a prospective way of solving this problem Such materials are notable due to increased values of physical, mechanical and thermophysical properties, which is a determining factor in the fight against corrosion of parts of technological equipment of modern industry in conditions of aggressive environments impact. It is known [2, 5, 11,12,13,14,15,16,17,18, 23] that the increase of cohesion and especially of thermophysical properties of polymer composites is possible by their modification, plasticisation or introduction of nano- and micro- additives with homeopathic content. Authors of [4] have shown that the introduction of disperse nanoparticles to the polymer matrix with insignificant content (from 0.05 up to 0.15%) ensures 2.2 – 2.8 times increase of cohesion properties of protective coatings
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