Analysis of polyurethane top-coat destruction influence on erosion kinetics of polyurethane-epoxy coating system

Abstract

Article citation info: (*) Tekst artykułu w polskiej wersji językowej dostępny w elektronicznym wydaniu kwartalnika na stronie www.ein.org.pl KoTnArowsKA D. Analysis of polyurethane top-coat destruction influence on erosion kinetics of polyurethane-epoxy coating system.

The Influence of Battery Acid on the Destruction of Acrylic Coatings of Car Bodies

“…The kinetics of the destruction of polymer coatings resulting from operational environment influence (in the form of climatic factors and environment pollution) is not presently recognized well enough [14][15][16][17][18][19]. It is caused mainly by the fact that polymer coatings, which protect the surface of technical objects against the destructive influence of the environment (environmental factors), also submit to the destruction of complex aetiology [16,17].…”

“…The lower this value, the greater is the coating wettability, and the larger is its surface contact with aggressive media, which leads to higher absorption of these media by the coating. Aggressive media absorption into coatings contributes to their swelling and to the degradation of their chemical structure [15,24,25,40]. In the case when θ C = 45-90 • , water permeation into the coating's superficial layers substantially depends on its chemical structure and surface roughness [17].…”

“…For example, in the case of acrylic coatings aged in a climatic station for one year, the band's intensity increase was stated for wavenumbers γ, equal to 1724 and 1690 cm −1 , both corresponding to carbonyl stretching frequency (carbonyl valence vibrations) [16]. Oxidized external sublayers of the topcoats show increased brittleness, which contributes to their chipping and the formation of pits, leading to an increase in the coating's roughness [15,24,25].…”

“…The coating's increased resistance to operational factors, including ultraviolet radiation, is achieved by nanoparticles' introduction to their structure, e.g., aluminium trioxide, titanium dioxide, or silicon dioxide [5,32,44,49]. It should be stressed that nanoparticles effectively fill nano-and micropores existing in polymer coatings, increasing their tightness, which limits aggressive media migration [15,25].…”

“…Coating-forming material is most frequently modified with nanoparticles of silicon dioxide (called silica) of a mass share from 3.5% [15] to 18% [5]. It is important that addition of nanofillers to the topcoat material only very slightly influences its transparency.…”