Polycarbonate Composition UV Absorber Low Temperature Impact
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Solution Overview
Problem
Polycarbonate compositions used outdoors face challenges in maintaining both optical and mechanical properties, particularly impact strength, under adverse environmental conditions such as UV light exposure and low temperatures, which affects their long-term usability and structural integrity.
Innovation Solution
A polycarbonate composition containing 0.05% to 0.5% by weight of a UV absorber and 0.0001% to 0.03% by weight of 2-[2-hydroxy-4-(2-ethylhexyl)oxy]phenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine, which enhances the physical and mechanical properties, including notched impact strength after UV light irradiation at low temperatures, making it suitable for solid and multi-wall panels and multi-layer systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional UV absorbers are used in polycarbonate compositions, then UV protection is provided, but impact strength deteriorates especially at low temperatures
Solution Approach 1:
The patent applies parameter changes by optimizing the concentration of UV absorbers within a specific range (0.05-0.5 wt%) and adjusting the molecular weight of polycarbonate (10,000-100,000). This precise parameter optimization maintains effective UV absorption while preserving impact strength, especially at low temperatures, resolving the contradiction between UV protection and mechanical performance
Solution Approach 2:
The patent creates a composite material system combining polycarbonate with specifically selected UV absorbers (benzotriazole and triazine types) in optimized ratios. This composite approach provides synergistic effects where the UV absorbers protect against degradation while the polycarbonate matrix maintains structural integrity and impact strength, even when exposed to UV radiation at low temperatures
2Reliability
If polycarbonate is used for outdoor applications, then structural integrity is required, but mechanical properties deteriorate under adverse environmental conditions
Solution Approach 1:
The patent applies preliminary action by incorporating UV absorbers into the polycarbonate composition before the material is exposed to environmental conditions. This pre-protection mechanism prevents UV-induced degradation before it can occur, maintaining mechanical properties and structural integrity during outdoor service. The stabilizers are integrated at the molecular level to provide continuous protection against harmful UV radiation
Solution Approach 2:
The patent optimizes the molecular weight of polycarbonate within the range of 10,000-100,000 and controls the concentration of UV absorbers at 0.05-0.5 wt%. These parameter changes enhance the material's resistance to environmental degradation while maintaining adequate mechanical properties, ensuring reliable structural performance in outdoor applications
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 exhibits improved notched impact strength and maintains excellent physical and mechanical properties even after UV light irradiation at -20 °C, ensuring long-term structural integrity and stability, making it suitable for outdoor applications like solid and multi-wall panels.
Implementation Method 1
Polycarbonate compositions containing 0.05% to 0.5% by weight of a UV absorber and 0.0001% to 0.03% by weight of 2-[2-hydroxy-4-(2-ethylhexyl)oxy]phenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine
Data Source
AI summary
The present invention relates to a composition containing polycarbonate and 0.05% to 0.5% by weight of a UV absorber and 0.0001% to 0.03% by weight of 2-[2-Hydroxy-4-(2-ethylhexyl)oxy-]phenyl-4,6-di(4-phenyl)phenyl-1,3,5-triazine (CAS No. 204583-39-1).