IPN Dielectric Polymer for LED Heat Dissipation
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Solution Overview
Problem
Conventional heat dissipation substrates for high-power LEDs face issues with non-uniform distribution of heat-conductive fillers, limited flexibility in manufacturing, and excessive curing time, leading to inefficient heat dissipation and high interfacial temperatures.
Innovation Solution
A heat-conductive dielectric polymer material with an inter-penetrating-network (IPN) structure, comprising a thermoplastic plastic, thermosetting epoxy resin, and uniformly dispersed heat-conductive fillers, which is processed using thermoplastic methods to form a substrate with enhanced heat dissipation and voltage-resistant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional slurry is used for heat dissipation substrate, then the substrate can be formed with heat-conductive fillers, but the fillers are non-uniformly distributed affecting heat dissipation efficiency
Solution Approach 1:
The invention uses a composite material system consisting of thermoplastic polymer matrix combined with thermosetting resin and heat-conductive fillers. The thermoplastic polymer provides a homogeneous base that ensures uniform filler distribution, while the thermosetting resin enhances heat conductivity. This composite approach resolves the contradiction by creating a material structure where fillers are evenly dispersed throughout the polymer matrix, achieving both manufacturing precision and heat dissipation efficiency.
Solution Approach 2:
The invention changes the physical and chemical parameters of the polymer matrix by selecting specific thermoplastic polymers with appropriate viscosity, molecular weight, and processing temperature ranges. These parameter optimizations enable uniform filler incorporation during processing while maintaining the structural integrity needed for effective heat dissipation, thus resolving the distribution uniformity issue.
2Ease of manufacture
If slurry is prepared in advance, then coating can be performed, but the slurry cures within specific time causing waste and limiting flexibility
Solution Approach 1:
The invention extracts the curing function from the initial slurry preparation stage by using a thermoplastic polymer matrix that does not require immediate curing. The material remains processable for extended periods, allowing flexible manufacturing scheduling. Curing or crosslinking can be performed later if needed, eliminating the time constraint and waste associated with conventional slurry systems that must be used immediately after mixing.
Solution Approach 2:
The invention introduces dynamic control over the material state by using thermoplastic polymers that can be processed in a flexible, uncured state and then transitioned to a cured state when needed. This dynamic approach allows the manufacturing process to adapt to different production schedules and requirements, eliminating the rigid time constraints of conventional slurry systems.
3Strength
If hot pressing is conducted to form substrate, then the substrate gains structural integrity, but slurry flows out and separation occurs affecting filler distribution
Solution Approach 1:
The invention optimizes processing parameters including temperature, pressure, and time conditions during hot pressing to prevent slurry flow and filler separation. By carefully controlling these parameters within specific ranges, the material achieves proper bonding and structural integrity while maintaining uniform filler distribution throughout the substrate.
Solution Approach 2:
The composite material system of thermoplastic polymer, thermosetting resin, and heat-conductive fillers is designed to maintain its composite structure during hot pressing. The specific combination and proportions of these materials prevent phase separation and filler aggregation under processing conditions, ensuring both structural integrity and uniform filler distribution are achieved simultaneously.
4Reliability
If conventional dielectric material is used, then basic electrical insulation is provided, but heat dissipation capability is insufficient for high-power LEDs
Solution Approach 1:
The invention creates a composite material that simultaneously provides both electrical insulation and superior heat dissipation. The thermoplastic polymer matrix provides dielectric properties for voltage resistance, while the incorporated heat-conductive fillers (such as aluminum oxide, aluminum nitride, or boron nitride) provide thermal conductivity pathways. This dual-function composite resolves the contradiction by integrating both electrical and thermal performance requirements into a single material system.
Solution Approach 2:
The invention applies local quality enhancement by concentrating heat-conductive fillers in specific regions or orientations within the polymer matrix to optimize heat dissipation pathways while maintaining overall dielectric properties. This localized optimization allows the material to provide both voltage resistance and enhanced heat dissipation capability according to the specific thermal management requirements of the LED application.
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 IPN structure ensures uniform filler distribution, improved heat conductivity, and flexibility in substrate formation, effectively managing heat dissipation and extending the lifespan of LED components while maintaining high voltage resistance.
Implementation Method 1
The thermoplastic plastic and the thermosetting epoxy resin are mutually soluble and they could form a compatible or homogeneous mixture
Implementation Method 2
The heat conductivity of the heat-conductive dielectric polymer material is larger than 0.5 W/mK
Implementation Method 3
The curing agent is used to cure the thermosetting epoxy resin under a curing temperature
Data Source
AI summary
A heat-conductive dielectric polymer material having an inter-penetrating-network (IPN) structure includes a polymer component, a curing agent, and a heat-conductive filler uniformly dispersed in the polymer component. The polymer component includes a thermoplastic plastic and a thermosetting epoxy resin. The curing agent is used to cure the thermosetting epoxy resin at a curing temperature. The heat conductivity of the heat-conductive dielectric polymer material is larger than 0.5 W/mK. A heat dissipation substrate including the heat-conductive dielectric polymer material in the present invention has a thickness of less than 0.5 mm and bears a voltage of over 1000 volts.