Study of the humid heat, ultraviolet radiation durability of some coatings based on acrylic resins: III. Study of the influence of some light stabilizaton systems on the humid heat, ultraviolet radiation durability of some coatings based on acrylic polyo

Abstract

The influence of the content of the photostabilizers – the UV absorber T-1130 and the radical scavenger HALS, as well as their mixture with the weght ratio T-1130/HALS = 1/1 on the photocrosslinking process and properties of theUV-cured coating of the paint system alkyd/HDDA/TiO 2have been studied. It was determined that the increase the contents ofthe T-1130 or HALS up to 1,5 % or their mixture up to 2 % in the paint substantially decresed the conversion of double bonds of alkyd resins but insignificantly affected conversion of HDDA double bonds. Presence of the photostabilizers at the content 1,5 % or their mixture at the content 2% decresed the relative hardness of the cured coatings form 0,51 to 0,21 - 0,23 while their flexibility, impact resistance and adhesion remained to be 1 mm, 200 kg.cm and 0 point, respectivelly; the residual - CH₂  – group affter 260 accelerated weather testing increased from 46,8 % to 80,6 - 88 %.