Triazine UV Absorber for Polyester Resin
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Solution Overview
Problem
Current ultraviolet absorbers for polyester resins face challenges in maintaining long-wavelength UV-blocking effectiveness over time, suffer from low light resistance, and often result in precipitation, bleed-out, or color changes due to poor solubility and high concentration issues, especially in outdoor applications like solar cells.
Innovation Solution
A novel triazine-based compound with specific substituents providing high solubility and light resistance is incorporated into a polyester resin composition, ensuring long-wavelength UV-blocking efficacy without precipitation or color changes, even at high concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organic ultraviolet absorbers with maximum absorption wavelength in the long-wavelength ultraviolet region are used, then the absorption wavelength can be designed to cover UV-A region, but the light resistance is poor and the ultraviolet blocking effect wears off with the passage of time
Solution Approach 1:
The patent modifies the molecular structure parameters of the ultraviolet absorber by introducing specific substituents (electron-withdrawing groups like -CF3, -NO2, -CN, or -SO3H at positions 2, 4, or 6 of the triazine ring) to achieve both long-wavelength absorption and high light resistance simultaneously
Solution Approach 2:
The patent creates a composite molecular structure combining triazine core with specific substituent groups to achieve synergistic effects of broad UV absorption and enhanced photostability
2Object-affected harmful factors
If benzophenone-based or benzotriazole-based ultraviolet absorbers are added in high concentration to cut light up to long-wavelength region, then the ultraviolet blocking effect is improved, but precipitation or bleed-out occurs during long-term use
Solution Approach 1:
The patent changes the solubility parameters of the ultraviolet absorber by introducing polar substituents (especially -SO3H group) that enhance interaction with polyester resin chains, allowing high concentration addition without precipitation
Solution Approach 2:
The patent introduces specific functional groups at specific positions of the triazine ring to create local polar regions that interact with the polyester resin, improving compatibility and preventing phase separation
3Object-affected harmful factors
If benzophenone-based or benzotriazole-based ultraviolet absorbers are added in high concentration, then the long-wavelength ultraviolet blocking is improved, but odor problems occur
Solution Approach 1:
The patent changes the molecular weight and structural complexity parameters of the ultraviolet absorber, creating a larger conjugated system with higher molecular weight that reduces volatility and eliminates odor while maintaining UV absorption performance
4Reliability
If inorganic ultraviolet absorbers are used, then the durability such as weather resistance and heat resistance is excellent, but the absorption wavelength is determined by the band gap and the latitude in selection is narrow
Solution Approach 1:
The patent applies parameter changes to organic molecules by adjusting substituent positions and types to achieve continuous tuning of absorption wavelength, providing versatility comparable to inorganic absorbers while maintaining organic material advantages
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 compound maintains long-wavelength UV-blocking effectiveness for an extended period, prevents precipitation and color changes, and is odorless, enhancing the durability and performance of UV-resistant materials.
Implementation Method 1
the compound represented by formula (1) has a characteristic in that it has solubility in an organic solvent and light resistance as well as having a maximum absorption wavelength in the long-wavelength ultraviolet region
Data Source
AI summary
To provide a polyester resin composition being able to maintain a long-wavelength ultraviolet-blocking effect for a long period of time, ensuring high solubility for a solvent, and having excellent light resistance. A polyester resin composition comprising a compound represented by the following formula (1) and a polyester resin:wherein each of R1a, R1b, R1c, R1d and R1e independently represents a hydrogen atom or a monovalent substituent excluding OH, at least one of the substituents represents a substituent having a positive Hammett's σp value, and the substituents may combine with each other to form a ring; and each of R1g, R1h, R1i, R1j, R1k, R1m, R1n and R1p independently represents a hydrogen atom or a monovalent substituent, and the substituents may combine with each other to form a ring.