Comparative study about the thermal stability and UV resistance of some paint layers for electro-energetic equipment
In order to determine the durability of polymer coatings using investigation techniques based on X-rays diffraction and combined techniques for thermal analysis (TG-DTA-DTG), were determined the changes of structure and of their thermo-oxidative characteristics (6 different paint types having different characteristics) after exposure to UV radiation (60W/m2 in range of 300-400nm). The experimental results, indicate that UV radiation induce different changes (function of the commercial type of any paint) of the investigated topcoat paint films respectively, increase of the crystallinity (and, implicit, of the fragility) function of the exposure dose, which was between 0,0005 and 0,0150%/Wh/m2.
Nano Oxides UV Protectors for Transparent Organic Coatings
optical and photocatalitic properties. The two modification of TiO 2 - rutile and anatase- are used in coatings industry and their specific optical properties (reflection and/or absorption of UV and visible light), together with crystal structure, size and morphology of the individual particles and distribution of dopants play the key role for the different functions of TiO 2 [7]. In the present work the preparation and optical properties of acryl-polyurethane polymer films containing iron doped titania and mixture of titania and iron oxide nano powders (UV-Vis spectra, transparency and colours) have been studied and compared with coating containing others nano oxides (like nano-CeO 2 , nano-ZnO or nonoFe 2 O 3 ) used as UV absorbers for transparent organic coatings.
Einsatz von Eisenglimmer im Langzeit-Korrosionsschutz
On etudie les causes de l'action anticorrosion de ce pigment: stabilite chimique de Fe 2 O 3 , grandeur des particules, effet barriere envers l'humidite, resistance aux intemperies due a la forme lamellaire des particules. On etudie egalement l'amelioration de l'adherence des liants oxydants sur les surfaces de zinc par l'emploi de ces pigments