Coatings Trends & Technologies
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Coatings Trends & Technologies
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Martin Chi

Martin Chi

Product Marketing and Regulatory Affairs Specialist
Chitec Technology Co., Ltd.

 


 

The Non-Migration Study of Reactive UV Absorbers

Adding UV absorber (UVA) is a simple but efficient way to upgrade coatings against sunlight exposure. However, the migratory nature of UVAs limits formulators to improve weather resistance by increasing the dosage and besides, various environment factors could be able to remove/ extract UVAs from coating layers, decreasing the effective dosage over time. A reactive UVA could be an ultimate solution. In this research, a novel benzotriazole (BTZ) UV absorber is introduced. It carries two primary hydroxyl groups, which can react with isocyanates and melamine resins and covalently bond with the polymer backbone. We use solvent/ simulant extraction as an accelerated migration simulation to demonstrate the non-migration performance of reactive type comparison against other additive type UVAs. This advanced technology overcomes the migration issue and dramatically improves the coatings performance to levels that were otherwise unattainable.


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