Migration of hindered amine light stabilizers in automotive clearcoats

被引：0
作者：
M. E. Nichols
S. L. Kaberline
机构：
[1] Ford Motor Company,Ford Research and Advanced Engineering
来源：
Journal of Coatings Technology and Research | 2013年 / 10卷
关键词：
Durability; Diffusion; Hindered amine light stabilizer; HALS; TOF-SIMS;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The diffusion behavior of two hindered amine light stabilizers (HALS) [bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl)-sebacate and bis(1,2,2,6,6-pentamethyl-4-piperidinyl)-sebacate] in an automotive clearcoat has been quantified via time-of-flight secondary ion mass spectrometry. Diffusion couples made from clearcoats with and without HALS allow for the estimation of the diffusion coefficient of one of the HALS. The high diffusion coefficient of one of the HALS contradicts the presence of HALS gradients in weathered coating systems. This discrepancy is ascribed to a decreasing diffusion coefficient of the HALS in the coating matrix due to a weathering-induced increase in the Tg of the clearcoat.
引用
收藏
页码：427 / 432
页数：5
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