UVRAP Polymer Coating for UV Protection and Surface Stability
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Solution Overview
Problem
Coatings for non-living and non-keratinous materials face challenges with light-induced degradation, particularly at the surface, where UV absorption is insufficient, leading to photochemical reactions that cause color deviation, loss of gloss, and cracking, despite the use of UV-absorbing compounds like benzotriazole derivatives.
Innovation Solution
The development of an ultraviolet radiation absorbing polymer composition (UVRAP) that includes a polymer compound with specific chromophores, which can be used in coatings for non-living and non-keratinous materials, providing enhanced photo stability, high gloss retention, and high migration resistance with low volatility, by reacting with isocyanate or melamine crosslinking coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a UV-absorbing compound is added to the coating, then UV protection is improved, but surface degradation still occurs due to insufficient UV absorption at the coating surface
Solution Approach 1:
The patent changes the molecular weight parameter of the UV-absorbing compound from low to high (polymer form), which fundamentally alters its migration behavior and volatility, enabling it to remain at the coating surface for effective UV absorption
Solution Approach 2:
The patent creates a composite UV protection system by combining high molecular weight UV-absorbing polymers with HALS compounds, where each component addresses different aspects of surface degradation through their complementary mechanisms
2Object-affected harmful factors
If a low molecular weight UV absorber is used, then UV absorption efficiency is improved, but migration resistance and volatility control are worsened
Solution Approach 1:
The patent applies parameter change by increasing the molecular weight of the UV-absorbing compound to polymer levels, which directly reduces volatility and migration while maintaining UV absorption capability through the polymer's chromophore groups
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The UVRAP composition effectively stabilizes coatings against light-induced degradation, maintaining mechanical properties and appearance, and preventing delamination, especially on materials like wood, ceramics, and metals, while ensuring low volatility and high performance.
Implementation Method 1
The compound that absorbs UV-light reduces the intensity of UV-light within the coating
Implementation Method 2
HALS compounds scavenge efficiently free radicals formed at the coating surface, where minor or no protection through the UVA is given. This process has been extensively studied and is essentially a cyclic chain breaking antioxidant process which is known as the Denisov cycle
Data Source
AI summary
The present invention relates to the use of an ultraviolet radiation absorbing polymer composition (UVRAP) as an UV absorbing agent in a coating for non-living and non-keratinous materials and a composition stabilized against light-induced degradation comprising a coating for non-living and non-keratinous materials subject to light-induced degradation, and the ultraviolet radiation absorbing polymer composition (UVRAP).