Study on the Design of Ultra-yellowing-resistant UV Curing Coatings
First,coatings films were prepared with a series of combinations of different types of main resins,monomers,and initiators in UV curing coatings.After 168 h of QUV ageing tests,main materials with a color difference ΔE under 1.5 were selected.These include a modified epoxy acrylic resin,monomer HDDA,and initiator MBF.The study also investigates the effects of adding UV absorbers and anti-yellowing agents to UV curing coatings on the yellowing resistance and other physicochemical properties of the coatings films.Preliminary experimental results indicate that when the weight percentage of UV absorbers and anti-yellowing agents reaches over 1%,the yellowing resistance of the coatings films significantly improves.Through a series of combination tests,UV curing coatings with excellent yellowing resistance were ultimately obtained,with ΔE less than 1 after the 168 h ageing test,thus providing a pathway for the preparation of yellowing-resistant UV coatings products.
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