LED Reflector Polyamide Composition Heat Light Resistance
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Solution Overview
Problem
Existing reflectors for LEDs fail to maintain high reflectance and whiteness over time due to issues like heat resistance, light resistance, and discoloration, which are not adequately addressed by previous technologies.
Innovation Solution
A polyamide composition with specific dicarboxylic acid units, such as 1,4-cyclohexanedicarboxylic acid, and aliphatic diamine units, along with optional fillers, reinforcement materials, and light stabilizers, is used to create a reflector that maintains high reflectance and whiteness even after prolonged LED light exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If ceramic is used for the reflector, then heat resistance is improved, but productivity and initial reflectivity deteriorate
Solution Approach 1:
The patent uses a composite material consisting of polyamide resin combined with specific inorganic fillers (titanium oxide, zinc oxide, or magnesium oxide) to achieve both heat resistance and high productivity. This composite approach allows the reflector to withstand thermal curing processes while enabling efficient manufacturing through injection molding, resolving the contradiction between heat resistance and productivity
2Productivity
If heat-resistant plastic is used for the reflector, then productivity is improved, but heat resistance during thermal curing deteriorates
Solution Approach 1:
The patent modifies the thermal properties of plastic materials by selecting polyamide resin with specific characteristics (melting point and heat resistance parameters) that enable it to withstand thermal curing temperatures of 100-200°C. This parameter optimization allows the reflector to maintain both high productivity through plastic molding and sufficient heat resistance during the curing process
3Productivity
If heat-resistant plastic is used for the reflector, then productivity is improved, but light reflectance deteriorates due to discoloration
Solution Approach 1:
The patent incorporates light-resistant inorganic fillers (titanium oxide, zinc oxide, or magnesium oxide) into the polyamide resin composite to prevent discoloration and maintain light reflectance. These fillers act as UV absorbers and stabilizers, preserving the reflector's optical properties while allowing the use of productive plastic molding processes
Solution Approach 2:
The patent uses inexpensive inorganic filler materials that provide long-term light resistance and structural stability. These fillers are cost-effective and enable the production of durable reflectors with maintained optical properties, achieving both productivity and sustained light reflectance without requiring expensive specialized materials
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 polyamide composition ensures the reflector retains high reflectance and whiteness for an extended period, offering improved heat and light resistance, and can be used in various LED applications including back light sources and automobile lamps.
Implementation Method 1
the reflector retains high reflectance and whiteness for an extended period
Data Source
AI summary
The present invention provides a reflector for an LED, including a polyamide composition and configure to keep high reflectance and high degree of whiteness even after being irradiated with LED light for a long period of time. The present invention is a reflector for an LED, including a polyamide composition containing polyamide (A) that has dicarboxylic acid units including 50 to 100 mol % of 1,4-cyclohexanedicarboxylic acid units and diamine units including 50 to 100 mol % of aliphatic diamine units having 4 to 18 carbon atoms.