Triazine UV Absorber Composition for Thermal Coloration Resistance
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Solution Overview
Problem
Conventional UV absorbers used in synthetic resins for optical materials suffer from poor resistance to thermal coloration, leading to discoloration during high-temperature molding processes, and existing triazine UV absorbers exhibit susceptibility to thermal coloration despite their resistance to weather and heat.
Innovation Solution
A UV absorber composition comprising a triazine compound combined with a diarylpentaerythritol diphosphite compound and/or an organic cyclic phosphite compound, and/or a hindered phenol compound, which improves the thermal coloration resistance of synthetic resin compositions used in optical films and sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional UV absorbers are used in sufficient amounts to provide adequate UV absorption, then UV absorption performance is improved, but thermal coloration resistance deteriorates due to discoloration during high-temperature molding
Solution Approach 1:
The patent employs a composite UV absorber system combining triazine compound (1) with specific phosphite compounds (2, 3) and/or hindered phenol compounds (4). This composite approach allows the triazine to provide primary UV absorption while the phosphite and hindered phenol compounds act as synergistic stabilizers that prevent thermal coloration during molding, resolving the contradiction between UV absorption effectiveness and thermal stability.
Solution Approach 2:
The phosphite compounds and hindered phenol compounds serve as intermediary substances that mediate between the triazine UV absorber and the synthetic resin matrix. These intermediaries protect the triazine from undergoing thermal coloration reactions while maintaining its UV absorption functionality, thus preventing the harmful thermal coloration effect without compromising UV protection.
2Reliability
If triazine UV absorbers are used to achieve weather and heat resistance, then resistance to weathering is improved, but thermal coloration resistance deteriorates during high-temperature molding processes
Solution Approach 1:
The patent creates a composite stabilizer system where triazine compound (1) provides weather and UV resistance, while phosphite compounds (2, 3) and hindered phenol compounds (4) specifically address thermal coloration during molding. This multi-component composite approach allows simultaneous achievement of weather resistance and thermal processing stability.
Solution Approach 2:
The invention applies different functional compounds to address different environmental conditions: triazine compound (1) is optimized for UV and weather resistance, while phosphite and hindered phenol compounds are specifically deployed to protect against thermal coloration during high-temperature molding. Each component is strategically selected for its specific protective function against different harmful conditions.
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 combination of triazine, phosphite, and hindered phenol compounds enhances the thermal coloration resistance of synthetic resin compositions, preventing discoloration and maintaining the optical properties of films and sheets under high-temperature conditions.
Implementation Method 1
a UV absorber composition comprising a triazine compound... which exhibits UV absorption suited for applications to optical films
Implementation Method 2
a phosphite compound having a specific structure and/or a hindered phenol compound having a specific structure exhibit marked effects on the improvement of the thermal coloration resistance of a UV absorber per se comprising the triazine compound
Data Source
AI summary
A synthetic resin composition containing, 100 parts by mass of a synthetic resin, 0.001 to 10 parts by mass of a triazine compound represented by general formula (1) shown below, and 0.001 to 10 parts by mass of a diarylpentaerythritol diphosphite compound represented by general formula (2) shown below and/or 0.001 to 10 parts by mass of an organic cyclic phosphite compound represented by general formula (3) shown below and/or 0.001 to 10 parts by mass of a hindered phenol compound represented by general formula (4) shown below. In formula (1), R1 is C1-C12 alkyl group, etc.; R2 is C1-C8 alkyl group, etc.; R3 is hydroxyl group, etc.; and R4 is -O-R1, etc. In formula (2), R5 is C1-C4 alkyl group, etc. In formula (3), R6 and R8 is each C1-C4 alkyl group, etc, and R7 is C1-C18 alkyl group. In formula (4), R9 is a residue remaining after removing n hydroxyl groups from a mono- to tetravalent alcohol, and n is an integer 1-4.