Two-Pack Thermal Interface Composition for Vibration-Stable Cooling
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Solution Overview
Problem
Low-viscosity thermally conductive greases used in electronic components are prone to dropping and fail to conform to vibrations, leading to reduced reliability and ineffective heat dissipation.
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 applications and cannot sufficiently remove heat
Solution Approach 1:
The patent applies parameter changes by controlling the viscosity of the organopolysiloxane within a specific range (100 to 1000 mPa·s at 25°C) to balance coating performance and anti-dropping properties. The viscosity is optimized to ensure easy application while preventing downward flow in vertical orientations, thereby maintaining heat removal effectiveness.
Solution Approach 2:
The patent uses composite materials by combining organopolysiloxane with thermally conductive fillers (such as aluminum oxide, aluminum nitride, or boron nitride) to create a grease that maintains both good coating characteristics and sufficient thermal conductivity. The composite structure allows the base material to provide low viscosity for coating while the filler particles provide thermal conduction pathways.
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 warp from vibration
Solution Approach 1:
The patent optimizes the viscosity parameter of the organopolysiloxane to fall within 100 to 1000 mPa·s, which provides sufficient fluidity for conformal coating while maintaining enough body to adhere to surfaces under vibrational stress. This parameter control ensures the grease fills warps and gaps effectively without being too thin to maintain contact under vibration.
3Temperature
If thermally conductive filler is added to improve heat conduction, then thermal conductivity is improved, but viscosity increases and coating performance deteriorates
Solution Approach 1:
The patent controls the viscosity of the base organopolysiloxane to be within 100 to 1000 mPa·s, which provides a balance point that allows adequate thermally conductive filler to be incorporated while maintaining acceptable coating performance. The base material's viscosity is optimized to ensure the final grease remains workable despite filler addition.
Solution Approach 2:
The patent creates a composite grease system where thermally conductive fillers are dispersed in the organopolysiloxane base. The base material is specifically selected to provide appropriate rheological properties that allow filler incorporation without excessive viscosity increase, maintaining coating applicability while achieving desired thermal conductivity.
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 thermally conductive cured product achieves effective heat dissipation with thermal conductivity of 1.0 to 3.0 W/mK, suppressing dropping and reliability issues, even in vertical applications and under vibration.
Implementation Method 1
heat is efficiently transferred by interposing a thermally conductive material between the heat generating electronic component and the heat sink or the like
Implementation Method 2
The first agent contains an organopolysiloxane having a structural unit represented by general formula (a1-3), a branched structure and having a vinyl group at least at an end of a structural unit represented by general formula (a1-2) or in a side chain of a structural unit represented by general formula (a1-1), a thermally conductive filler, a silica powder, and a platinum catalyst
Data Source
Figure 1~2
Figure 3
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.