METHODOLOGICAL APPROACH TO ASSESSING THE EFFECT OF POROSITY ON THE OPERATIONAL PROPERTIES
Functional polymer powder coatings are considered, their advantages over traditional paint coatings are noted. The set of operational indicators of coatings is called, their dependence on both external and internal factors is estimated. Of the latter, the porosity of the coating material is distinguished. The analysis of the types of porosity is carried out, it is noted that it is a generalized indicator. In addition to porosity, the performance properties of coatings also depend on the shape, size, and tortuosity of the pores. Due to the fact that porosity has a significant impact on all the main technical properties of coatings, the study of this issue seems relevant from a practical point of view. Therefore, there is a need to develop an effective approach, highlighting the formalization of each of its stages as the main task. Since, in general, the coverage and the factors acting on it are a complex system, methods of system analysis and mathematical modeling are used. At the same time, in the aggregate of external factors acting on coatings during storage, transportation, and operation of products, atmospheric and actual operational ones are distinguished. Attention is drawn to the fact that their impact leads to a change in indicators, both porosity and the material of the frame (matrix) of the coating. The relations characterizing the influence of porosity, internal and external factors on the physicochemical properties of polymer powder coatings are recorded in a general form.