Thermally Conductive Polysiloxane Composition with Bleed Resistance
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Solution Overview
Problem
Thermally conductive compositions used in electronic parts face issues with stability, bleeding, and handling properties due to the degradation of hardness over time and the inability to maintain high thermal conductivity while preventing oil bleeding, which affects the reliability and performance of electronic devices.
Innovation Solution
A thermally conductive polysiloxane composition is developed, comprising a thermally conductive filler, a polyorganosiloxane resin with curable functional groups, and a siloxane compound with an alkoxysilyl group and linear siloxane structure, optimized through surface treatment and additive selection to enhance stability, handling, and bleed resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermally conductive filler is added to improve thermal conductivity, then the radiator performance is enhanced, but the viscosity increases and handling becomes difficult
Solution Approach 1:
The patent changes the physical and chemical parameters of the filler particles by applying surface treatments with silane coupling agents and metal oxides. This modifies the surface properties to reduce interparticle friction and improve flow characteristics, allowing high filler loading (70-90 wt%) while maintaining acceptable viscosity and handling properties
Solution Approach 2:
The patent uses composite filler structures combining different materials (e.g., aluminum powder coated with metal oxide and silane coupling agent). This composite approach allows the filler to maintain high thermal conductivity while the surface treatments reduce aggregation and improve dispersion, thereby maintaining better flowability and handling ease
2Temperature
If the filling ratio of thermally conductive filler is increased to achieve high thermal conductivity, then the radiator performance improves, but the fluidity deteriorates
Solution Approach 1:
The patent modifies particle parameters through surface treatment with specific metal oxides (alumina, silica) and silane coupling agents. This changes the surface energy and morphology parameters, reducing particle-particle interactions and maintaining fluidity even at high filling ratios of 70-90 wt%
Solution Approach 2:
The surface treatment agents act as intermediaries between the filler particles and the polymer matrix. These intermediaries improve wetting and dispersion, preventing agglomeration and maintaining fluidity at high filler concentrations
3Ease of operation
If oil is added to reduce viscosity and improve handling, then the ease of operation improves, but the thermal conductivity decreases
Solution Approach 1:
The patent changes the viscosity parameters through surface treatment of fillers rather than adding oil. The treated filler surfaces reduce interparticle friction and improve flow, achieving low viscosity without introducing thermal barriers that oil would create
Solution Approach 2:
The patent extracts the need for oil additives by implementing surface treatments on the filler particles. The surface-modified fillers inherently provide improved flowability and handling without requiring additional lubricating agents, thus maintaining thermal conductivity
4Speed
If conventional surface treatment agents are used to improve filling property, then the fluidity is maintained, but the hardness decreases over time causing stability problems
Solution Approach 1:
The patent uses composite surface treatments combining metal oxides (alumina, silica) with silane coupling agents. This composite approach creates a multi-layer surface structure that provides both fluidity maintenance and long-term hardness stability, preventing the softening observed with conventional single-agent treatments
Solution Approach 2:
The patent applies different surface treatment components at different levels: metal oxide coating provides initial stability and dispersion, while the silane coupling agent layer provides ongoing crosslinking and hardness maintenance. This localized functional distribution ensures both fluidity and long-term stability
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 excellent thermal conductivity, stability, and bleed resistance, ensuring reliable performance and easy handling, while maintaining appropriate hardness and thermal conductivity, thus addressing the limitations of conventional thermally conductive materials.
Implementation Method 1
the composition comprising a thermally conductive filler and a silicone is essentially required to have thermal conductivity and therefore, for achieving high radiator performance, inorganic particles, such as alumina having a very small particle diameter, which have been subjected to surface treatment
Implementation Method 2
a polyorganosiloxane resin comprising at least one polysiloxane having one curable functional group in the molecule
Data Source
AI summary
A thermally conductive polysiloxane composition includes (A) a thermally conductive filler, (B) a polyorganosiloxane resin including at least one polysiloxane having one curable functional group in the molecule thereof, and (C) a siloxane compound having an alkoxysilyl group and a linear siloxane structure.