A protective coating based on carboxymethylcellulose and zinc powder has been developed. It was established that the incorporation of zinc and the plasticizer glycerol into the polymer matrix leads to an increase in adhesion and mechanical strength of the coatings—from 5.1 MPa to 15.5 MPa and from grade 4 to grade 0, respectively. The morphology of the coating was examined using optical microscopy. It was shown that zinc particles are relatively uniformly distributed within the polymer matrix, and their aggregation decreases upon glycerol addition. Digital images of the coatings were used to quantitatively evaluate the fraction of zinc particles located at the coating–substrate interface. Due to particle sedimentation, the particle fraction at the interface exceeds that on the surface by 10–20%, which improves the coating’s adhesion to the substrate. The coating was found to be resistant to acidic and alkaline media, organic solvents, and alcohols.
Keywords: carboxymethylcellulose, zinc powder, coating, mechanical strength, adhesion, chemical resistance
This paper presents the results of an investigation into the adhesion properties of release coatings based on polyisobutylene applied to metallic substrates. A software tool was developed in Microsoft Visual Studio using the C++ programming language to compute the composition and effective technological parameters for forming coatings that ensure optimal adhesion to protected surfaces. As a case study, the method of calculating the relationships between composition, temperature, and formation time is demonstrated for coatings achieving the highest adhesion, corresponding to a score of “zero” on the standardized six-point cross-cut adhesion test. It is shown that the application of the developed software enables parameter evaluation within 1–2 seconds. The computational results are experimentally validated. The morphology of the coatings was examined using optical microscopy. It was observed that no delamination occurs at the intersection points of cuts or within the grid pattern.
Keywords: coating, adhesion, microstructure, cross-cut test, polyisobutylene, optimization