The impact of cellulose esters on clearcoat appearance, sag resistance and spray solids were investigated. The results showed that use of cellulose esters as rheology additives in 1K automotive OEM clearcoats promoted flow and leveling, resulting in a smoother finish and increased DOI over control clearcoats. Improved surface smoothness was achieved while maintaining the same level of sag resistance at equal or increased spray solids. The impact of cellulose esters on the clearcoat durability was tested by Florida exposure. After 22 months of Florida exposure, two clearcoats containing Solus 2100 and CAB 551-0.01 demonstrated superior 20° gloss retention as compared to control clearcoats. The use of cellulose ester rheology modifiers improved the surface smoothness of clearcoat formulations, and at the same time provided the benefits of improved sag resistance. To further understand the mechanism behind these benefits attributes, the impact of cellulose esters on the drying behavior of automotive OEM clearcoats were investigated using in-situ drying rheology measurements and TGA. Steady state flow shear sweep results illustrated that the two clearcoats containing cellulose esters were close to Newtonian fluids while the control clearcoat demonstrated thixotropic characteristics. TGA measurements revealed that the formulations containing cellulose esters exhibited faster solvent release. Drying rheology data illustrated that the clearcoats containing cellulose esters build viscosity faster than control after being applied to substrate. Newtonian characteristics promote the flow; fast solvent release, high Tg, and viscosity build prevent the clearcoat from sagging after application.
Use of cellulose esters as rheology additives for automotive OEM clearcoats
Die Anwendung von Celluloseestern als Rheologieadditive für Automobil-OEM-Klarlacke
2012
11 Seiten, 9 Bilder, 6 Tabellen, 8 Quellen
(nicht paginiert)
Conference paper
Storage medium
English
Use of cellulose esters as rheology additives for automotive OEM clearcoats
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