Prediction of Durability of Thermal Insulating Epoxy Coatings with Regard to Climatic Ageing

Abstract

It is generally accepted that the color and performance characteristics of liquid thermal insulation coatings are affected by the combined effect of various climatic factors such as solar radiation, temperature fluctuations, moisture, precipitation and others. This work presents the results of a scientific study of the full-scale exposure of coatings with regard to climatic ageing. Methods have been carried out, such as: spectrophotometry and direct scanning; determining adhesion, determining the adhesion strength of facing and protective coatings; and thermal conductivity and thermal resistance. As the results of the research work have shown, only in situ climatic tests, accompanied by the obligatory recording of the aggressive factors affecting the coating, make it possible to assess changes in the properties of epoxy coatings in full-scale conditions and, consequently, their climatic resistance by the methods of spectrophotometry and direct scanning. The ageing of polymer composites is known to be accompanied by a change not only in elasticity but also in color. Of the epoxy coatings tested, Etal-45M showed the greatest color variation during the in situ climate test. The most decorative resistant coatings are obtained using epoxy resin ED-20 + modified epoxy resin Etal-1440N.

The Aging of Polymers under Electromagnetic Radiation

“…For instance, color change is an observable change that occurs in the polymer's surface texture as well as crack density once it is exposed to a UV radiation source, thus indicating thermooxidative degradation. Consistent with this result, Qi et al [22] and Zhumadilova et al [23] reported that exposing polymer composites to hydrothermal environments accelerates their degradation as they are oxidated, softened, and hydrolyzed faster, leading to color and thermal execution changes. Moreover, the results of this investigation show that alterations in the glass transition temperature are frequently noted during thermooxidative degradation, and they result from additional network crosslinking.…”

“…This phenomenon induces the failure of the interface and the ultimate damage of the composite [ 22 ]. Zhumadilova et al [ 23 ] agree with the latter assertion, claiming that the color and execution features of liquid thermal insulation coatings are influenced by the combined impacts of diverse climatic conditions. Such conditions include solar radiation, as well as changes in temperature, moisture, and precipitation, among others [ 23 , 24 ].…”

“…Zhumadilova et al [ 23 ] agree with the latter assertion, claiming that the color and execution features of liquid thermal insulation coatings are influenced by the combined impacts of diverse climatic conditions. Such conditions include solar radiation, as well as changes in temperature, moisture, and precipitation, among others [ 23 , 24 ]. In this regard, understanding the thermal performance of polymer composites is integral in conceptualizing their life and reliability and enhancing their application in construction and civil engineering fields.…”

“…Moreover, the results of this investigation show that alterations in the glass transition temperature are frequently noted during thermooxidative degradation, and they result from additional network crosslinking. Polymeric materials’ performance changes are attributed to exposure to thermal-oxidative conditions like heat, moisture, UV radiation, and precipitation [ 23 , 24 ]. Lastly, the study indicates that fracture toughness increases during extended thermooxidative exposures as a result of chain degradation, which successfully plasticizes the resin.…”

Protective Properties of Thermal-Insulation Coatings under Conditions of Long-Term Exposure to Natural Climatic Factors

“…According to the composition of the studied epoxy polymers, the polymers presented in Table 1 have higher viability. To reduce the viscosity of the developed compositions, the epoxy resin ED-20 was replaced with the low-viscosity resin Etal-247, as well as by introducing aliphatic epoxy resin Etal-1 as a flexibilizer into the binder [21][22][23][24]27]. It has been determined that a decrease in the viscosity of epoxy binders is possible due to the introduction of solvents or heating the mixture.…”