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Scratch resistance and weatherfastness of uv‐curable clearcoats
Author(s) -
Jung T.,
Valet A.
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200209)187:1<531::aid-masy531>3.0.co;2-p
Subject(s) - materials science , coating , curing (chemistry) , triazine , scratch , stabilizer (aeronautics) , degradation (telecommunications) , moisture , chemical resistance , uv curing , chemical engineering , composite material , solvent , polymer chemistry , organic chemistry , chemistry , computer science , mechanical engineering , telecommunications , engineering
UV‐cuing has found an increasing number of industry allocations over the past decade due to its unique benefits, e.g. solvent free formulations, high cure speed and low temperature processing. In addition to these benefits two additional properties of uv‐cured coatings are of today's interest, especially in the automotive industry: scratch resistance and resistance against chemicals. One of the most important requirements for a broad use of uv‐curable coatings in the coating industry is that coatings are stable against degradation caused by atmospheric influences since coatings for outdoor use are subject to especially harsh weathering conditions, e.g. uv‐light, oxygen, moisture and air pollutants. This weathering leads to a degradation of the polymeric binder. Clearcoats containing photoinitiators based on bis‐acylphosphinoxide (“BAPO”) and a combination of hydroxyphenyl‐s‐triazine uv‐absorber and a sterically hindered amine as a light stabilizer package show a very good curing behavior as well as an improved weatherfastness over a long period of time and a good scratch and chemical resistance.