Stabilizers, such as organic UV-absorbers (UVA), sterically hindered amines (HALS), and anti-oxidants (AO) find widespread use as coatings additives to prevent degradation during outdoor weathering and/or thermal exposure. In water-based (WB) coatings, many of the well-established non-polar stabilizers are difficult to incorporate due to insolubility and/or incompatibility with the aqueous coating or paint formulations. Getting a stable, uniform mixture, leading to homogeneous coating formulations upon storage and use without separation of stabilizers is critical. Several undesired phenomena such as sedimentation, and exudation may occur if the stabilizers are incompatible in WB coatings, leading to inadequate protection, or even detrimental coating performance.
A new emulsification technology was developed to make traditional stabilizers water dispersible. Optimized combination of several synergistic water-based UVA/HALS blends were designed to meet varying enduse performance expectations of different waterborne coating formulations. A water-based anti-oxidant was also developed to improve performance of water-based coatings under high thermal exposure.
A new waterborne non migrating light stabilizer system, containing a reactable non-basic HALS and a reactable photo permanent UV absorber was developed, for use in waterborne one component acrylic melamine coatings and waterborne two component acrylic/ polyisocyanate crosslinked coatings. This unique stabilizer system was designed to prevent migration issues in WB plastic coatings. It could also meet the high performance and durability requirements of water-based automotive and industrial coatings.
These new water-based light stabilizers and anti-oxidants thereby address the VOC and HAPS concerns, while maintaining the efficacy of conventional additives with the benefits of water miscibility, ease of incorporation and handling.
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