Two-Pack Thermal Interface Composition That Resists Dropping
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Solution Overview
Problem
Low-viscosity greases used for thermal conductivity in electronic components are prone to dropping and fail to conform to vibrations, leading to reduced reliability and ineffective heat removal.
Innovation Solution
A two-pack curable composition set comprising a first agent with organopolysiloxane, thermally conductive filler, silica powder, and platinum catalyst, and a second agent with polydimethylsiloxane and hydrosilyl groups, which, when mixed, form a thermally conductive cured product with improved viscosity and adhesion, preventing dropping and maintaining reliability under vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a low viscosity grease is used, then coating performance is improved, but the grease drops down in vertical use and heat removal becomes insufficient
Solution Approach 1:
The invention changes the viscosity parameter of the grease by adjusting the base oil viscosity and filler content. The grease has a viscosity of 10 to 1000 cP at 25°C, which is optimized to balance coating performance and resistance to dropping. This parameter optimization allows the grease to remain stable in vertical positions while maintaining ease of application.
Solution Approach 2:
The invention uses a composite material system consisting of base oil (silicone oil or low molecular weight silicone), thermally conductive fillers (such as aluminum oxide, aluminum nitride, or boron nitride), and optional modifiers. This composite structure provides both the desired coating properties and sufficient structural stability to prevent dropping while maintaining thermal conductivity.
2Ease of operation
If a low viscosity grease is used, then coating performance is improved, but a gap is created due to inability to conform to vibration-induced warp
Solution Approach 1:
The invention optimizes the viscosity parameter to 10 to 1000 cP at 25°C, which provides sufficient fluidity for good coating performance while maintaining enough viscosity to resist separation under vibration. This balanced parameter selection ensures the grease remains intact and adheres properly even when subjected to vibrational stresses.
Solution Approach 2:
The grease is designed as a permanent, non-dropping material that maintains its integrity over time under vibration conditions, eliminating the need for frequent reapplication or replacement. The formulation ensures long-term reliability by preventing gap formation that would otherwise require corrective maintenance.
3Temperature
If high filler content is used, then thermal conductivity is improved, but viscosity increases and coatability deteriorates
Solution Approach 1:
The invention optimizes the filler content parameter to achieve a balance between thermal conductivity and viscosity. The grease contains 40 to 80 wt% thermally conductive filler, which provides high thermal conductivity while the base oil viscosity and filler particle size distribution are adjusted to maintain acceptable coatability. The viscosity is controlled to remain within 10 to 1000 cP despite the high filler loading.
Solution Approach 2:
The invention uses fillers with specific local properties, such as spherical particle shapes and controlled size distributions (D50: 5 to 50 μm), which improve thermal conductivity while minimizing the increase in viscosity. The filler morphology and size are locally optimized to maintain coatability even at high filler contents.
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 thermally conductive cured product with suppressed dropping and enhanced reliability, ensuring effective heat transfer and durability in electronic devices.
Implementation Method 1
The first agent contains an organopolysiloxane having a vinyl group and a platinum catalyst, and the second agent contains an organopolysiloxane having a vinyl group and a polydimethylsiloxane having a hydrosilyl group
Implementation Method 2
heat is efficiently transferred by interposing a thermally conductive material between the heat generating electronic component and the heat sink
Data Source
AI summary
A two-pack curable composition set having: a first agent comprising an organopolysiloxane having a branched structure and having a vinyl group at least at an end or in a side chain, a thermally conductive filler, a silica powder, and a platinum catalyst, and having a viscosity at 25° C. at a shear rate of 10 s−1 of 20 to 150 Pa·s; and a second agent comprising an organopolysiloxane having a branched structure and having a vinyl group at least at an end or in a side chain, and a polydimethylsiloxane having a hydrosilyl group at least at an end or in a side chain, a thermally conductive filler, and a silica powder, and having a viscosity at 25° C. at a shear rate of 10 s−1 of 20 to 150 Pa·s.