LED Reflection Plate Polyamide Composition for Heat-Stable Reflectance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
LED reflection plates made of heat-resistant plastics face challenges in maintaining high light reflectance at elevated temperatures during production and in use environments, with existing techniques falling short in ensuring consistent performance over time.
Innovation Solution
A polyamide composition comprising a specific polyamide with 1,4-cyclohexanedicarboxylic acid units, titanium oxide, magnesium oxide, phenolic antioxidant, and phosphorus-containing antioxidant, formulated to provide heat resistance and stability, ensuring minimal decrease in light reflectance even after short-term and long-term heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat-resistant plastics are used for LED reflection plates to withstand high temperatures during production and use, then heat resistance is improved, but light reflectance decreases over time due to thermal degradation
Solution Approach 1:
The invention uses a composite material system consisting of polyamide resin combined with specific antioxidants (phenolic type and phosphorus-containing type) in controlled proportions. This composite formulation prevents thermal degradation of the polyamide, thereby maintaining light reflectance while withstanding high temperatures during production and use.
Solution Approach 2:
The invention optimizes the chemical composition parameters by controlling the proportions of different components: polyamide resin (100 parts), phenolic antioxidant (0.01-1.0 part), and phosphorus-containing antioxidant (0.01-1.0 part). By adjusting these parametric ratios, the material achieves both heat resistance and sustained light reflectance properties.
2Illumination intensity
If polyamide composition is optimized for high light reflectance, then optical performance is improved, but heat resistance deteriorates
Solution Approach 1:
The invention creates a composite material system that combines polyamide resin with dual antioxidant protection (phenolic and phosphorus-containing types). This composite structure allows the material to simultaneously achieve high light reflectance from the polyamide base and heat resistance through the synergistic antioxidant system that prevents thermal degradation.
Solution Approach 2:
The invention optimizes compositional parameters by maintaining polyamide resin as the primary component (100 parts) while adding controlled amounts of phenolic antioxidant (0.01-1.0 part) and phosphorus-containing antioxidant (0.01-1.0 part). This parametric optimization ensures both optical performance and thermal stability are achieved simultaneously.
3Ease of manufacture
If conventional antioxidant proportions are used in polyamide composition, then manufacturing simplicity is maintained, but light reflectance stability under heat deteriorates
Solution Approach 1:
The invention modifies the antioxidant proportion parameters from conventional levels to optimized ranges: phenolic antioxidant at 0.01-1.0 part and phosphorus-containing antioxidant at 0.01-1.0 part per 100 parts of polyamide resin. These adjusted parameters achieve superior light reflectance stability under heat while maintaining straightforward manufacturing processes.
Solution Approach 2:
The invention employs a composite antioxidant system combining phenolic and phosphorus-containing antioxidants in specific proportions within the polyamide matrix. This composite approach provides enhanced thermal protection and light reflectance stability while remaining compatible with existing manufacturing methodologies.
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 maintains high light reflectance and heat resistance, leading to a longer lifespan of light-emitting devices and improved moldability, effectively addressing the limitations of existing techniques.
Implementation Method 1
the content of the titanium oxide (B) is 10 to 100 parts by mass, the content of the magnesium oxide (C) is 0.50 to 15.0 parts by mass
Implementation Method 2
a phenolic antioxidant (D), and a phosphorus-containing antioxidant (E)... can show a small decrease in the light reflectance to maintain a high light reflectance both after short-time heating and after long-term heating
Data Source
Figure 1~2
Figure 3
AI summary
There is provided a polyamide composition for an LED reflection plate, including a polyamide (A), a titanium oxide (B), a magnesium oxide (C), a phenolic antioxidant (D), and a phosphorus-containing antioxidant (E), wherein the polyamide (A) is a polyamide having a dicarboxylic acid unit comprising 50% by mol or more of 1,4-cyclohexanedicarboxylic acid unit and a diamine unit and having a melting point of 280°C or higher; the phenolic antioxidant (D) does not have 4 or more phenol structures in its molecule; and the phosphorus-containing antioxidant (E) has 3 or more predetermined structures represented by the formula (1) in its molecule, wherein the content of the titanium oxide (B) is 10 to 100 parts by mass, the content of the magnesium oxide (C) is 0.50 to 15.0 parts by mass, and the content of the phenolic antioxidant (D) is 0.10 to 0.80 part by mass, with respect to 100 parts by mass of the polyamide (A); and the content of the phosphorus-containing antioxidant (E) satisfies the following expression (I): 0.25≤mass ratioD component/E component≤3.0 There are also provided a reflection plate obtained by molding the composition, and a light-emitting device having the reflection plate.