Thermally Conductive Polysiloxane Composition via Segmented Filler Treatment
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Solution Overview
Problem
The integral blend method for producing thermally conductive silicone compositions requires excessive surface treatment agents, leading to heat resistance issues and filler aggregation, especially with fillers having narrow particle size distributions, making it unsuitable for certain applications.
Innovation Solution
A method involving direct treatment of fillers with specific alkoxysiloxane surface treatment agents, reducing modifier usage and achieving a simple process, which allows for the production of a polysiloxane resin composition with improved thermal conductivity and reduced viscosity, applicable to fillers with monomodal particle size distributions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the integral blend method is used to mix silicone resin, filler, and surface treatment agent together at a time, then the production process is simple, but excessive surface treatment agent is needed causing heat resistance issues and filler aggregation
Solution Approach 1:
The production process is divided into two distinct stages: first, dispersing the filler in a solvent to create a uniform suspension, then adding the silicone resin and surface treatment agent. This segmentation prevents filler aggregation and reduces the required amount of surface treatment agent, resolving the contradiction between process simplicity and heat resistance.
Solution Approach 2:
The filler is pre-dispersed in a solvent before adding other components. This preliminary dispersion action ensures uniform distribution of filler particles, preventing aggregation and reducing the need for excessive surface treatment agent, thereby improving heat resistance while maintaining ease of manufacture.
2Temperature
If more thermally conductive filler is added to enhance thermal conductivity, then the thermal conductivity improves, but the filling property has a limitation requiring complex surface treatment
Solution Approach 1:
The patent changes the particle size distribution parameter of the filler, using a narrow distribution with specific diameter ranges. This parameter change allows for better packing and improved thermal conductivity without requiring complex surface treatments, as the uniform particle sizes naturally fill spaces more efficiently.
3Stability of the object's composition
If the solvent substitution method is used to disperse filler uniformly, then the filler dispersion is improved, but the production process becomes complicated
Solution Approach 1:
The patent merges the dispersion step with the mixing step by adding the filler-solvent suspension directly to the silicone resin and surface treatment agent in a single mixing operation. This combines multiple functions into one process, achieving uniform filler dispersion without complicating the overall production process.
4Manufacturing precision
If a filler with narrow particle size distribution is used, then the filling property is improved, but the integral blend method causes filler aggregation
Solution Approach 1:
The filler with narrow particle size distribution is pre-dispersed in a solvent before being combined with other components. This preliminary dispersion action prevents aggregation that would occur in the integral blend method, maintaining both the precision benefits of narrow particle distribution and the stability of the composition.
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
This method effectively reduces surface treatment agent usage, enhances thermal conductivity, and prevents filler aggregation, enabling the production of thermally conductive polysiloxane compositions with improved handling properties and heat resistance.
Implementation Method 1
by directly treating a filler with a specific alkoxysiloxane as a surface treatment agent
Implementation Method 2
a thermally conductive polysiloxane composition
Data Source
AI summary
A method for producing a polyorganosiloxane resin composition including: (a) mixing a thermally-conductive filler having a particle size distribution having a single peak, with a surface treatment agent containing a siloxane to form a mixture, and (b) mixing the mixture from step (a) with a polysiloxane resin.