Novel Triazine UV Absorber for Polycarbonate Resins
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Solution Overview
Problem
Conventional UV absorbers used in synthetic resins, such as triazine compounds, exhibit inadequate heat resistance and volatilization resistance, leading to reduced effectiveness and contamination of processing equipment, and poor compatibility with resin components, particularly in polycarbonate resins, resulting in impaired transparency and weatherability.
Innovation Solution
A novel triazine compound with a dimer structure, represented by specific general formulas, is developed, which provides excellent heat resistance, resistance to volatilization, and compatibility with resin components, serving as an effective UV absorber in synthetic resin compositions, particularly in polycarbonate resin compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional UV absorbers (benzophenones, benzotriazoles, cyanoacrylates) are added to polycarbonate resins, then UV protection is provided, but heat resistance deteriorates due to volatilization during processing and outdoor use
Solution Approach 1:
The invention changes the molecular structure parameters of the UV absorber by introducing a specific triazine core with bulky aromatic substituents and long alkylene chains, transforming the physical and chemical properties to achieve both UV absorption and heat resistance. The molecular weight and structural rigidity are optimized to prevent volatilization while maintaining UV filtering capability.
Solution Approach 2:
The patent creates a composite molecular structure combining the triazine UV-absorbing core with hydrophobic aromatic groups and flexible alkylene chains, integrating multiple functional characteristics into a single molecule that simultaneously provides UV protection, thermal stability, and compatibility with polycarbonate resin.
2Reliability
If conventional UV absorbers are added to polycarbonate resins, then UV protection is provided, but compatibility with resin components deteriorates, resulting in impaired transparency
Solution Approach 1:
The invention modifies the chemical structure parameters of the UV absorber by incorporating aromatic groups that are chemically similar to polycarbonate's aromatic rings, enhancing solubility and compatibility. The molecular geometry and polarity are adjusted to match the resin matrix, preventing phase separation and maintaining optical clarity.
Solution Approach 2:
The patent designs the UV absorber molecule with structural features that are homogeneous with the polycarbonate resin matrix, using similar aromatic moieties and bonding characteristics to ensure uniform distribution and dissolution, thereby maintaining transparency while providing UV protection.
3Reliability
If conventional UV absorbers are used, then UV protection is provided, but resistance to volatilization deteriorates, leading to contamination of processing equipment and reduced long-term effectiveness
Solution Approach 1:
The invention significantly increases the molecular weight and structural complexity of the UV absorber by combining a triazine core with multiple bulky aromatic substituents and long alkylene chains (8-20 carbon atoms), raising the boiling point and vapor pressure thresholds to prevent volatilization during high-temperature processing and outdoor exposure.
Solution Approach 2:
The patent creates a composite molecular architecture that integrates a rigid triazine UV-absorbing core with flexible hydrophobic alkylene chains and bulky aromatic groups, forming a stable molecular structure with high thermal stability and low volatility, suitable for high-temperature processing and long-term outdoor application.
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 novel triazine compound enhances the heat resistance and weatherability of polycarbonate resin compositions, preventing performance degradation during processing and outdoor use, while maintaining transparency and long-term effectiveness as a UV absorber.
Implementation Method 1
A triazine compound is known to have excellent UV absorbing effect as reported, e.g., in patent documents 1 to 6
Data Source
AI summary
A novel compound excellent in heat resistance, resistance to volatilization, and compatibility with a resin component and useful as a UV absorber and a synthetic resin composition containing the compound are provided. Specifically provided are a triazine compound of general formula (1), preferably general formula (2) and a synthetic resin composition containing 0.001 to 20 parts by mass of the compound per 100 parts by mass of a synthetic resin. The details of formulae (1) and (2) are as defined in the description.