Heterocyclic UV Absorbent Composition for Stable UV-A Blocking
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Solution Overview
Problem
Current ultraviolet absorbents, particularly benzophenone- and benzotriazole-based compounds, face issues with light stability and precipitation when used in higher concentrations to block long-wavelength UV light, and lack effective absorption in the UV-A range without developing color or being irritating to skin.
Innovation Solution
A novel heterocyclic compound with a specific structure, represented by Formula (1), is developed, which provides superior light fastness and absorbs UV rays in the longer wavelength range, preventing precipitation and maintaining stability over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the concentration of benzophenone- and benzotriazole-based ultraviolet absorbents is increased to block long-wavelength UV light, then the light blocking capability is improved, but precipitation and bleed out occur during long-term use
Solution Approach 1:
The invention changes the chemical structure parameters of the ultraviolet absorbent by introducing a heterocyclic ring structure with specific heteroatoms (Xa, Xb, Xc, Xd) and substitutable positions (Ya, Yb, Yc, Yd, Ye, Yf). This structural modification enables the compound to absorb long-wavelength UV light effectively while maintaining stability at lower concentrations, preventing precipitation and bleed out issues associated with high concentrations of conventional absorbents.
2Reliability
If inorganic ultraviolet absorbents are used to provide durability and heat resistance, then weather resistance and heat resistance are improved, but the degree of freedom in selecting compounds is limited and color development occurs
Solution Approach 1:
The invention creates a composite molecular structure combining organic framework (aromatic heterocyclic residue Het1) with heteroatom-containing rings (Xa, Xb, Xc, Xd). This composite structure integrates the benefits of organic compounds (design flexibility, UV-A absorption) with enhanced stability characteristics, achieving both adaptability and reliability simultaneously.
3Use of energy by moving object
If organic ultraviolet absorbents with maximum absorption wavelength in long-wavelength ultraviolet range are used, then UV-A absorption capability is improved, but light stability decreases and absorption capacity declines over time
Solution Approach 1:
The invention applies local quality by positioning specific heteroatoms (Xa, Xb, Xc, Xd) at strategic locations within the molecular structure and allowing substitution at specific positions (Ya, Yb, Yc, Yd, Ye, Yf). This localized structural optimization enables the molecule to absorb long-wavelength UV light while maintaining light stability through the specific electronic properties of the heteroatom-containing ring system.
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 effectively absorbs UV rays in the UV-A range without color development and maintains stability, making it suitable for use as an ultraviolet absorbent and fluorescent brightener, ensuring long-term performance without precipitation or bleed-out.
Implementation Method 1
the compound effectively absorbs UV rays in the UV-A range without color development and maintains stability
Implementation Method 2
maintains stability, making it suitable for use as an ultraviolet absorbent and fluorescent brightener, ensuring long-term performance without precipitation or bleed-out
Data Source
AI summary
A compound represented by the following Formula (1):wherein, Het1 represents a bivalent five- or six-membered aromatic heterocyclic residue and may further be substituted; Xa to Xd each independently represent a heteroatom and may further be substituted; Ya to Yf each independently represent a heteroatom or a carbon atom and may further be substituted; the ring bound to Het1 may have a double bond at any position.