Thermal Interface Composition Balancing Heat Transfer and Low Adhesion
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Solution Overview
Problem
Current thermal interface materials (TIMs) face challenges in achieving low adhesion force, high thermal conductivity, and flame retardancy while minimizing the use of halogen and phosphorus-based flame retardants, which often compromise mechanical properties and environmental safety.
Innovation Solution
A curable composition is developed that forms a TIM with low adhesion force, high thermal conductivity, and excellent flame retardancy, achieved through a specific combination of polyol components and fillers, which secures low specific gravity and thixotropy without relying heavily on halogen or phosphorus-based flame retardants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If silicone resin is used as the resin binder to achieve low adhesion force, then adhesion force is reduced, but the material becomes expensive and has limited uses due to contact failure
Solution Approach 1:
The patent changes the chemical composition parameters of the resin binder from silicone resin to polyurethane resin, achieving low adhesion force through molecular structure design rather than material selection. This allows the material to maintain low adhesion (1 N/mm² or less) while being suitable for electronic and electrical products without contact failure issues.
Solution Approach 2:
The patent uses a cost-effective polyurethane resin instead of expensive silicone resin, making the thermal interface material more economically viable while maintaining the required low adhesion force through formulation optimization rather than relying on expensive materials.
2Temperature
If polyurethane material is used to achieve high thermal conductivity, then thermal conductivity is improved, but adhesion force becomes too high for most adherends
Solution Approach 1:
The patent modifies the polyurethane resin parameters by incorporating specific plasticizers and adhesion modifiers in controlled amounts, changing the molecular mobility and surface energy parameters to reduce adhesion force to 1 N/mm² or less while preserving the high thermal conductivity (2.0 W/mK or more) of the polyurethane matrix.
Solution Approach 2:
The patent creates a composite thermal interface material combining polyurethane resin with fillers (such as aluminum oxide, aluminum nitride, or boron nitride) and carefully selected additives, achieving a balance between high thermal conductivity and low adhesion force through synergistic material composition.
3Force
If plasticizer is blended in large amount to control adhesion force, then adhesion force is reduced, but the inherent merits of the material are damaged and plasticizer may be eluted
Solution Approach 1:
The patent optimizes the plasticizer content parameter to a specific range (0.1-5 parts by weight per 100 parts of polyurethane resin), achieving low adhesion force through controlled molecular mobility rather than excessive plasticizer addition, thereby preventing material degradation and elution while maintaining polyurethane's inherent merits.
Solution Approach 2:
The patent introduces adhesion modifiers as intermediary substances that mediate between the polyurethane resin and adherend surfaces, reducing adhesion force through surface energy modification rather than relying on large amounts of plasticizer that could damage material stability or cause elution.
4Object-affected harmful factors
If halogen element-containing flame retardant is used to secure excellent flame retardant properties, then flame retardancy is improved, but dioxin is generated which is environmentally harmful and corrosive
Solution Approach 1:
The patent replaces harmful halogen-based flame retardants with phosphorus-based alternatives that provide equivalent or superior flame retardancy (achieving UL94 V-0 rating) while converting the harmful combustion byproduct profile to one that generates non-toxic phosphorus oxides instead of corrosive dioxins, thus protecting both the material and environment.
Solution Approach 2:
The patent changes the chemical composition parameter from halogen elements to phosphorus elements in the flame retardant system, fundamentally altering the combustion chemistry to produce benign phosphorus-containing residues rather than harmful dioxins, while maintaining excellent flame retardant properties through optimized phosphorus compound selection.
5Object-generated harmful factors
If phosphorus element-containing flame retardant is used to secure excellent flame retardant properties with less toxicity, then flame retardancy is improved and toxicity is reduced, but the material becomes expensive and heat dissipation properties are weakened
Solution Approach 1:
The patent creates a composite formulation combining phosphorus-based flame retardants with high thermal conductivity fillers (such as aluminum oxide, aluminum nitride, or boron nitride) in a polyurethane matrix, achieving a synergistic effect where the filler network maintains heat dissipation pathways while the phosphorus compounds provide flame retardancy with minimal toxicity.
Solution Approach 2:
The patent optimizes the phosphorus compound selection and concentration parameters, choosing specific phosphorus esters or phosphonates that have minimal impact on thermal conductivity, and balances the flame retardant loading to achieve UL94 V-0 rating without excessive use that would compromise heat dissipation properties or increase cost unnecessarily.
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 solution provides a TIM with low adhesion force, high thermal conductivity, and superior flame retardancy, ensuring safety and performance while reducing material costs and environmental impact by minimizing the use of hazardous flame retardants.
Implementation Method 1
a material in which a resin binder is filled with a filler having heat dissipation properties
Implementation Method 2
secures low specific gravity and thixotropy
Data Source
AI summary
A curable composition or a thermal interface material exhibiting low adhesion force to a predetermined adherend while having a low density as well as exhibiting a high thermal conductivity is provided. It also has excellent flame retardant properties, and exhibits ejection properties and thixotropy suitable for processes in a state where halogen flame retardants or phosphorus-based flame retardants are not used, or the use ratio thereof is minimized.