Thermal Silicone Paste Composition for Heat Transfer and Pump-Out Resistance
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Solution Overview
Problem
Existing heat conductive materials face challenges in achieving high thermal conductivity, ease of working, and improved slide resistance, particularly in electronic devices where heat dissipation is critical.
Innovation Solution
A heat conductive silicone composition comprising a crosslinked silicone gel, a specific silicone oil, an aluminum powder with a specific particle size distribution, a zinc oxide powder, and a volatile solvent, such as isoparaffin, which enhances thermal conductivity and resistance to pump-out phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sheet-like heat conductive materials are used, then ease of handling and stability are improved, but heat dissipation ability deteriorates due to increased contact thermal resistance
Solution Approach 1:
The invention changes the physical state parameter of the heat conductive material from solid sheet to paste form, enabling better conformability to surfaces and reduced contact thermal resistance while maintaining ease of application through controlled viscosity parameters
2Stability of the object's composition
If sheet-like materials are used, then shape stability is improved, but adaptability to device tolerance deteriorates and stress concentration increases
Solution Approach 1:
The invention uses a paste-like material that can deform and conform to irregular surfaces and tolerance variations, providing flexible adaptation while maintaining structural integrity through proper formulation
3Reliability
If paste-like heat conductive materials are used, then heat dissipation ability and adaptability are improved, but slide resistance deteriorates due to pump-out phenomenon
Solution Approach 1:
The invention creates a composite paste material combining heat conductive fillers with a specifically formulated silicone resin base, achieving both high thermal conductivity and improved slide resistance through the synergistic effects of the composite structure
Solution Approach 2:
The invention optimizes the viscosity parameter of the paste material to balance spreadability during application with resistance to pump-out during thermal cycling, using controlled rheological properties to prevent migration
4Ease of operation
If low viscosity paste is used for mass-scale manufacture, then ease of application is improved, but slide resistance deteriorates causing pump-out phenomenon
Solution Approach 1:
The invention precisely controls the viscosity parameter within an optimal range, ensuring the paste is fluid enough for easy screen printing and applicator deposition while maintaining sufficient body to resist gravitational and thermal cycling-induced migration
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 composition achieves high thermal conductivity while improving ease of working and pump-out resistance, ensuring effective heat removal and preventing device malfunction.
Implementation Method 1
a volatile solvent, especially isoparaffin base solvent having a boiling point of 80-360°C
Implementation Method 2
a heat conductive silicone composition comprising (A) a crosslinked silicone gel, (B) a silicone oil... (C) an aluminum powder... (D) a zinc oxide powder
Data Source
AI summary
A thermally conductive silicone composition that has high thermal conductivity and excellent workability and misalignment resistance, and contains, in specific ratios: a silicone gel cross-linked product (A); a silicone oil (B) not containing either aliphatic unsaturated bonds or SiH groups and being used as a surface treatment agent for components (C) and (D); an aluminum powder (C) including (C-1)-(C-3), (C-1) being an aluminum powder having an average particle diameter of 40-100 µm, (C-2) being an aluminum powder having an average particle diameter of at least 6 µm and less than 40 µm, and (C-3) being an aluminum powder having an average particle diameter of at least 0.4 µm and less than 6 µm; a zinc oxide powder (D) having an average particle diameter of 0.1-10 µm; and a volatile solvent (E).