Polyamide Reflector for LED Heat Resistance and Fluidity
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Solution Overview
Problem
Conventional polyamide reflectors for light-emitting devices lack sufficient fluidity, resistance to thermal and optical color changes, and durability, leading to reduced LED life and luminance.
Innovation Solution
A reflector composed of a polyamide polymerized from at least 50 mol% alicyclic dicarboxylic acid and 50 mol% diamine with a branched main chain, combined with titanium oxide and stabilizers, providing enhanced heat resistance, fluidity, and optical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional polyamide comprising terephthalic acid units is used, then soldering heat resistance is improved, but fluidity and resistance against thermal and optical color change are insufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the polyamide by using alicyclic dicarboxylic acid (50-100 mol%) instead of conventional terephthalic acid, and branched aliphatic diamine (50-100 mol%) instead of linear diamines. This parameter change achieves both high heat resistance (melting point 270-350°C) and improved fluidity during molding, resolving the contradiction between heat resistance and manufacturability.
Solution Approach 2:
The invention creates a composite polyamide material combining alicyclic dicarboxylic acid units with branched aliphatic diamine units. This composite structure provides synergistic effects where the alicyclic component contributes to heat resistance while the branched aliphatic component enhances fluidity and moldability, simultaneously satisfying both requirements.
2Temperature
If conventional polyamide comprising terephthalic acid units is used, then soldering heat resistance is improved, but resistance against thermal and optical color change is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters by incorporating alicyclic dicarboxylic acid units which provide inherent thermal and optical stability. The cyclic structure resists degradation from heat and UV exposure, preventing color change while maintaining the required heat resistance for soldering processes.
Solution Approach 2:
The invention avoids using expensive stabilizers and additives by selecting base monomers (alicyclic dicarboxylic acid and branched aliphatic diamine) that inherently provide long-term stability against thermal and optical degradation, eliminating the need for additional protective components.
3Ease of manufacture
If reflector material deteriorates, then LED assembly can be manufactured, but LED life and luminance are reduced
Solution Approach 1:
The invention provides beforehand cushioning against deterioration by selecting polyamide monomers with inherent stability against thermal, mechanical, and optical degradation. The alicyclic structure and branched aliphatic chains are pre-configured to resist common failure modes in LED operating environments, preventing deterioration before it occurs and ensuring long LED life while maintaining manufacturability.
Data Source
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Figure 3(a)~3(d)
AI summary
The present invention relates to a reflector for a light-emitting device consisting of (A) an polyamide composition comprising a polyamide polymerized from (a) a dicarboxylic acid comprising at least 50 mol% of an alicyclic dicarboxylic acid and (b) a diamine comprising at least 50 mol% of a diamine with a branched main chain.