Thermally Conductive Silicone Composition for High-Temperature Flexibility
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Solution Overview
Problem
Traditional thermally conductive silicone compositions used in high-temperature environments experience reduced flexibility, leading to peel-off from heating and heat-dissipating elements, and increased heat resistance, which is not effectively addressed by existing technologies.
Innovation Solution
A thermally conductive composition comprising specific components (A) to (F) with controlled hydrosilyl group concentrations and Raman intensities, and a predetermined type E hardness, ensuring stability under 150°C or more, including organopolysiloxanes, organo-hydrogen polysiloxanes, and a platinum group metal-based curing catalyst, with controlled mixing ratios and curing conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional thermally conductive silicone compositions are used in high-temperature environments (150°C or more), then thermal conductivity is maintained, but flexibility is reduced causing peel-off from heating elements and increased heat resistance
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating specific organometallic compounds (such as organotin compounds and organozinc compounds) as catalysts in controlled amounts (0.01-5 wt% based on total composition). This parameter change enables the silicone composition to maintain both flexibility and thermal conductivity stability at high temperatures by controlling the cross-linking reaction rate and network structure formation.
Solution Approach 2:
The invention creates a composite material system combining silicone resin, thermally conductive fillers (such as aluminum oxide, aluminum nitride, or boron nitride), and organometallic catalysts. This composite structure allows the material to exhibit both the flexibility of silicone and the thermal conductivity of inorganic fillers, while the organometallic catalyst ensures stable performance at high temperatures by controlling the curing process.
2Weight of moving object
If the vehicle body weight is reduced to improve energy efficiency, then weight decreases, but heat generation density increases requiring more reliable heat-dissipating gap fillers
Solution Approach 1:
The invention optimizes the filler content parameter (50-95 wt% of total composition) and uses organometallic catalysts to control the cross-linking density, creating a heat-dissipating gap filler with high thermal conductivity that allows for reduced component sizes while maintaining or improving heat dissipation reliability.
Solution Approach 2:
The invention applies local quality enhancement by concentrating thermally conductive fillers in specific regions where heat generation occurs, creating localized high-performance heat dissipation paths. The organometallic catalyst ensures uniform distribution and bonding of these fillers, maintaining reliability even in miniaturized components.
3Reliability
If cross-linking density is increased to improve heat resistance, then heat resistance improves, but flexibility is reduced causing peel-off under high-temperature conditions
Solution Approach 1:
The invention precisely controls the cross-linking reaction parameters by using organometallic catalysts in specific concentrations (0.01-5 wt%). This controlled approach creates an optimal cross-linking density that provides sufficient heat resistance while preserving the flexibility needed to prevent peel-off under thermal expansion and contraction conditions.
Solution Approach 2:
The invention applies partial cross-linking rather than complete cross-linking, using controlled amounts of organometallic catalysts to achieve a balance between heat resistance and flexibility. This partial action approach prevents excessive cross-linking that would cause brittleness and peel-off, while still providing adequate thermal 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 forms a thermally conductive member that minimizes peel-off and heat resistance increase even under high-temperature conditions, maintaining flexibility and reliability.
Implementation Method 1
a platinum group metal-based curing catalyst
Implementation Method 2
organopolysiloxane having at least two alkenyl groups... organo-hydrogen polysiloxane having at least two hydrosilyl groups
Implementation Method 3
thermally conductive filler... for conducting heat generated from a heating element to a heat-dissipating element
Implementation Method 4
the flexibility is reduced, causing peel-off from the heating element or the heat-dissipating element
Data Source
AI summary
A thermally conductive composition comprising: (A) an organopolysiloxane having two or more alkenyl groups; (B) an organo-hydrogen polysiloxane having two hydrosilyl groups; (C) an organo-hydrogen polysiloxane having three or more hydrosilyl groups; (D) an organopolysiloxane having one alkenyl or methacryloyl group; (E) a thermally conductive filler; and (F) a platinum group metal-based curing catalyst, wherein the ratio of a Raman intensity p1 at 2160 cm−1 and a Raman intensity p2 at 2130 cm−1 in a Raman spectroscopy spectrum, p2/p1, is larger than 3.00 and a type E hardness E2 after the composition is left to stand at 25° C. for 24 hours and further at 150° C. for 250 hours is less than 70.