Aliphatic TPU Protective Coating for UV-Resistant LED Light Sources
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Solution Overview
Problem
Conventional protective materials for LED light sources, such as silicon and epoxy, degrade under UV light and heat, leading to darkening and loss of transparency, which affects the luminescent capability and mechanical durability, especially in high-brightness applications like emergency exit guidance systems.
Innovation Solution
The use of aliphatic thermoplastic polyurethane (TPU) as a transparent protective material that remains clear and flexible, providing mechanical protection and maintaining visibility even under UV light and heat exposure, suitable for both individual LED components and light-source bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective materials (silicon, epoxy) are used for LED light sources, then mechanical protection and flexibility are provided, but the materials darken and lose transparency under UV light and heat exposure
Solution Approach 1:
The patent changes the chemical composition parameters of the protective material by using aliphatic TPU instead of conventional silicon or epoxy materials. This material substitution maintains mechanical protection properties while resisting UV-induced darkening and transparency loss, directly resolving the contradiction between reliability and illumination intensity.
Solution Approach 2:
The patent employs aliphatic thermoplastic polyurethane as a composite protective material that combines the flexibility and mechanical protection of silicon with UV and heat resistance. This composite approach eliminates the darkening issue while maintaining all necessary protective functions, resolving the transparency-reliability contradiction.
2Illumination intensity
If high-brightness LED light sources are used to improve visibility in emergency situations, then illumination intensity increases, but heat generation accelerates deterioration of protective materials
Solution Approach 1:
The patent changes the thermal stability parameters of the protective material system by selecting aliphatic TPU, which maintains its optical and mechanical properties at higher temperatures. This enables high-brightness LEDs to operate without accelerating material deterioration, resolving the contradiction between illumination intensity and reliability.
3Ease of manufacture
If aromatic TPU or other conventional materials are used as protective coating, then application is simple and cost-effective, but UV exposure causes yellowing and transparency deterioration
Solution Approach 1:
The patent changes the chemical structure parameters of the TPU material from aromatic to aliphatic configuration. This fundamental parameter change eliminates the yellowing and transparency loss under UV exposure while preserving the ease of application and cost-effectiveness, resolving the contradiction between manufacturing simplicity and optical clarity.
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 aliphatic TPU ensures the clarity and transparency of the protective material are maintained, preventing undesirable dimming and enhancing mechanical durability, thus ensuring effective illumination in critical situations like fire emergencies.
Implementation Method 1
the materials used nowadays, from which elasticity is also required, are sensitive to UV light and/or to heat
Implementation Method 2
the materials used nowadays, from which elasticity is also required, are sensitive to UV light and/or to heat
Implementation Method 3
from which elasticity is also required
Implementation Method 4
Another drawback is also the impurity that gains access to the surface of a LED light source via diffusion for the aforementioned reasons
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
LED light source (105), which comprises at least one light-emitting component (1 12). The light- emitting component (1 12) is at least partly protected with a transparent protective material (1 13), which contains aliphatic thermoplastic polyurethane (TPU). The invention also relates to a light-source band.