Translucent Coating Composition UV Degradation Resistance
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Solution Overview
Problem
Current architectural coating compositions lack sufficient ultraviolet protective ability, leading to inadequate protection of substrates such as woods, ceramics, and polymers from ultraviolet degradation.
Innovation Solution
A coating composition comprising a latex emulsion with polymeric particles, a combination of UV protectants including zinc oxide and cerium oxide particles, and hindered amine light stabilizers, which are formulated to be transparent or translucent, ensuring minimal impact on the substrate's appearance while providing enhanced UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coating compositions are used, then the coating provides basic protective function, but the ultraviolet protective ability is insufficient
Solution Approach 1:
The patent combines multiple UV protectant types (transparent iron oxides, zinc oxide, cerium oxide) with latex emulsion and other coating components to create a composite coating composition that provides superior ultraviolet protection compared to conventional single-component coatings. This composite approach allows synergistic UV absorption and scattering while maintaining coating integrity and substrate protection.
Solution Approach 2:
The patent incorporates specific UV-absorbing particles (transparent iron oxides, zinc oxide, cerium oxide) at controlled concentrations within the coating matrix to provide localized UV protection. These particles are distributed throughout the coating to create regions of enhanced UV absorption and scattering, directly addressing the insufficient UV protective ability of conventional coatings.
2Reliability
If zinc oxide particles are used for UV protection, then ultraviolet protection is provided, but the particles impart a white color that affects appearance
Solution Approach 1:
The patent uses transparent iron oxides and cerium oxide particles with specific size ranges (0.1-10 micrometers) that provide UV protection while remaining substantially transparent to visible light. These particles are distributed throughout the coating to provide localized UV absorption without imparting significant color, thus maintaining coating transparency and aesthetic appearance.
Solution Approach 2:
The patent specifies precise particle size parameters for the UV protectants (0.1-10 micrometers for transparent iron oxides, similar ranges for zinc oxide and cerium oxide). By controlling particle size within this range, the coating achieves optimal balance between UV protection capability and visual transparency, as smaller particles scatter less visible light while maintaining effective UV absorption.
3Illumination intensity
If small particle size UV protectants are used, then transparency is maintained, but the UV protective effect may be reduced
Solution Approach 1:
The patent combines multiple types of UV protectant particles (transparent iron oxides, zinc oxide, cerium oxide) with complementary absorption characteristics. This composite particle system provides broad-spectrum UV protection across different wavelengths while maintaining transparency. The combination of particle types compensates for the reduced protective effect of individual small particles, achieving both transparency and effective UV protection.
Solution Approach 2:
The patent optimizes particle size parameters within the 0.1-10 micrometer range to balance transparency and UV protection. This size range allows particles to be small enough to maintain coating transparency while being large enough to effectively absorb and scatter UV radiation. The specific size parameters are chosen to maximize the surface area for UV absorption while minimizing visible light scattering.
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 composition effectively protects substrates from ultraviolet degradation, maintaining the transparency and translucency of coatings while significantly improving wear and sheen characteristics, and reducing color change upon exposure to accelerated weathering.
Implementation Method 1
The first UV protectant can be UV-protective zinc oxide particles or UV-protective cerium oxide particles, or both. These compounds can be organic or inorganic in nature... transparent iron oxides, also known as trans-oxides, have been used in paints and stains... other metal oxides, e.g., cerium oxide particles, when possessing a relatively small particle size, do not generally impart a white color to a composition and have recently been used as UV protectants in coatings and bulk materials.
Implementation Method 2
The second UV protectant can be a transparent non-oxide or a hindered amine light stabilizer, or both. The hindered amine light stabilizer may be combined with an organic UV absorber.
Data Source
AI summary
The present invention relates to substrates and coating compositions disposed thereon containing improved ultraviolet degradation resistance. Specifically, these coating compositions can contain multiple UV protectants and can advantageously be used in transparent, semi-transparent, and/or translucent coatings on substrates, particularly opaque or semi-opaque substrates such as wood, e.g., in order to inhibit, to reduce, and/or to minimize UV degradation of said substrates.