Semi-Aromatic Polyamide LED Reflector Composition
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Solution Overview
Problem
Existing compositions for LED reflectors exhibit inadequate resistance to both high temperatures and light generated by LEDs, which affects the luminous efficiency and longevity of LED screens.
Innovation Solution
A composition comprising 30 to 97% semi-aromatic polyamide, 2 to 50% white pigments, 0 to 50% reinforcements, and 0.1 to 10% metal hydroxide or metal oxide, with an organic phosphite content up to 3%, which maintains thermal resistance while significantly improving LED resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If compositions comprising semi-aromatic polyamide, titanium dioxide, reinforcements, and magnesium hydroxide are used to achieve thermal resistance, then thermal resistance is improved, but resistance to LED light (prevention of yellowing) is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing specific antioxidants (phenolic antioxidants in 0.1-5 parts by weight and hindered amine light stabilizers in 0.1-5 parts by weight) to change the material's resistance properties. This parameter change enables the material to simultaneously achieve both thermal resistance and LED light resistance, resolving the contradiction between maintaining thermal stability and preventing light-induced yellowing.
Solution Approach 2:
The patent creates a composite material system that combines semi-aromatic polyamide base resin with multiple functional additives including titanium dioxide (5-100 parts by weight), magnesium hydroxide (0.5-30 parts by weight), antioxidants, and light stabilizers. This composite approach integrates thermal resistance properties from the base polyamide and magnesium hydroxide, while the added antioxidants and light stabilizers provide LED light resistance, thus resolving the contradiction between thermal and optical stability.
2Stability of the object's composition
If material properties are maintained under high temperatures during LED manufacturing and operation, then thermal resistance is improved, but the material still suffers from yellowing under LED light exposure
Solution Approach 1:
The patent applies preliminary protective action by incorporating antioxidants (particularly phenolic antioxidants) and hindered amine light stabilizers into the composition before the yellowing problem occurs. These additives preemptively prevent oxidative degradation and photo-degradation of the polyamide chains, thereby maintaining both thermal stability and color stability under LED light exposure throughout the product's lifecycle.
Solution Approach 2:
The patent converts potentially harmful effects (oxidation and photo-degradation that cause yellowing) into beneficial protection by using antioxidants and light stabilizers. These additives sacrifice themselves to prevent the degradation of the main polyamide structure, transforming the harmful oxidative and photolytic processes into a protective mechanism that maintains material stability under both thermal and optical stress.
Data Source
AI summary
The invention relates to a composition including 30 to 97 wt % of at least one semi-aromatic polyamide, 2 to 50 wt % of white pigments, 0 to 50 wt % of strengthening agents, 0.1 to 10 wt % of at least one metal hydroxide and/or of at least one metal oxide other than a transition metal oxide, and up to 3 wt % of an organic phosphite. The invention also relates to the use of said composition for forming all or part of an electronic component, as well as to a reflector having a light-emitting diode (LED) and entirely or partially consisting of a material obtained from said composition.