Esthetic performance of thermochromic pigments in cataphoretic and sprayed coatings for outdoor applications

Abstract

This study aims to assess the aesthetical performances of thermochromic coatings for outdoor applications. In details, this work focuses on the efficiency of thermochromic pigments inside cataphoretic and sprayed primers, evaluating the possible synergic effect of a protective transparent topcoat. The structure of thermochromic pigments is examined by optical microscope, and their color-changing behavior is evaluated by colourimetric measurements. Colourimetric analyses are also carried out to monitor the thermochromic performances of the coatings during exposure to an aggressive NaCl solution and UV-B radiations, and to assess the protective role of the topcoat. In addition to that, wet-and dry-abrasion tests are carried out to define the suitability of these coatings for outdoor applications where good resistance to mechanical damage is required. Thus, this work evidences the better aesthetical features of the cataphoretic primer, which, however, particularly suffers from chemicalphysical degradation processes. Nevertheless, the application of the transparent topcoat allows to maintain the integrity of the cataphoretic primer. The double-layer coating exhibits a remarkable color-changing behavior even when subjected to degradation phenomena due to exposure to aggressive environments.

Durability of Acrylic Cataphoretic Coatings Additivated with Colloidal Silver

“…On the other hand, samples A1 and A2 reveal a yellow and orange coating, respectively, the tones of which strongly depend on the concentration of the silver-based filler. The coloring of the composite layers appears homogeneous and constant over the entire surface, proof of the high aesthetic efficiency and covering power of cataphoresis [32]. Dissolving in water, the colloidal silver powders create a yellow-orange color solution.…”

“…The protective performances, for example, have been further improved by adding cerium-based nanoparticles [25,26], or thanks to functionalized graphene oxide flakes [27][28][29][30]. Furthermore, the aesthetic features obtainable from cataphoresis by incorporating particular thermochromic pigments were also evaluated [31], which compared the results with the behavior of the typical spray process [32].…”

Facile Route to Effective Antimicrobial Aluminum Oxide Layer Realized by Co-Deposition with Silver Nitrate

“…The scrub test is a technique developed for the study of abrasion resistance of organic coatings, assessing the reinforcing contribution of pigments [70][71][72] and inorganic [73] and organic [74][75][76] fillers. The alumina layer possesses much greater abrasion resistance than a typical organic coating: as a matter of fact, in this work, the scrub test was chosen not to replicate particularly abrasive phenomena, but to simulate repeatedly cleaning the surface.…”

Development of novel reversible thermometer from N‐isopropylacrylamide and dicyanodihydrofuran hydrazone probe

“…Their reversible color-changing property allows durability and reusability. [3][4][5][6][7] Nanoparticle polymer thermometers composed of nanosized self-assembling molecules have received much attention for their biological compatibility, photocatalytic ability, and rapid response. They have been investigated for their potential application in pollutants degradation and battery safety monitoring.…”