Silicone Thermal Gel Composition for Vertical Stability and Heat Transfer
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Solution Overview
Problem
Existing silicone compositions fail to achieve high thermal conductivity while maintaining mechanical integrity under vertical configurations, often cracking or falling due to high filler loading which reduces tackiness.
Innovation Solution
A single-part, curable thermal polysiloxane gel formulation comprising vinyl-functionalized silicone polymer, silyl-hydride functionalized polysiloxane crosslinker, and methacryloxypropyl/polyethene glycol polyhedral silsesquioxanes, forming a three-dimensional network that embeds thermally conductive fillers, with a high loading of 90 wt% and a 1:3 to 4:1 ratio of functional groups, enhancing thermal conductivity and vertical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If high filler loading is used to achieve high thermal conductivity, then thermal conductivity is improved, but the gel loses tackiness and cracks during operation
Solution Approach 1:
The patent employs a composite material system combining vinyl-functionalized silicone polymer, silyl-hydride crosslinker, and dual-functionalized polyhedral silsesquioxanes (containing both methacryloxypropyl and polyethene glycol groups). This composite formulation creates a synergistic network where the polyhedral silsesquoxanes act as multifunctional crosslinking agents, providing both structural integrity and thermal conductivity pathways through the high filler loading (90 wt%) while preventing crack formation through the dual-functionalized molecular architecture.
Solution Approach 2:
The patent optimizes the ratio of methacryloxypropyl-functionalized groups to polyethene glycol-functionalized groups in the polyhedral silsesquoxanes within the range of 1:3 to 4:1. This parameter optimization balances the crosslinking density and network structure, allowing the gel to maintain adequate tackiness for bonding while supporting high thermal filler content without cracking. The specific ratio control adjusts the polymerization kinetics and final network morphology to resolve the contradiction between thermal conductivity and mechanical integrity.
2Adaptability or versatility
If the gel is configured vertically for charging operations, then adaptability to charging systems is improved, but gravitational force causes vertical fall and structural degradation
Solution Approach 1:
The patent uses a composite formulation with vinyl-functionalized silicone polymer base, silyl-hydride crosslinker, and dual-functionalized polyhedral silsesquoxanes that create a three-dimensional crosslinked network. This network structure provides internal reinforcement that counteracts gravitational forces in vertical configurations. The high filler content (90 wt%) further enhances structural rigidity while the crosslinked polymer matrix maintains cohesion, preventing vertical fall and structural degradation during vertical charging operations.
Solution Approach 2:
The dual-functionalized polyhedral silsesquoxanes create localized regions of enhanced crosslinking density within the gel matrix. The methacryloxypropyl groups provide primary crosslinking points while polyethene glycol groups create additional network nodes, resulting in a heterogeneous network with locally reinforced regions that resist gravitational deformation. This local quality enhancement allows the gel to maintain structural integrity under vertical loading without compromising overall flexibility and adhesion.
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 gel achieves thermal conductivity of 6.0 W/m·K with vertical stability, exhibiting less than 2 mm vertical fall over 100 hours at 150°C and a dispense rate of at least 10 g/min, maintaining structural integrity.
Implementation Method 1
The vinyl-functionalized silicone polymer base, silyl-hydride functionalized polysiloxane crosslinker and methacryloxypropyl/polyethene glycol-functionalized polyhedral silsesquioxanes would react upon mixture to form a three-dimensional polymer network
Implementation Method 2
the thermal gel is single-part and curable, demonstrates high thermal conductivity
Data Source
AI summary
The present invention relates to a single-part thermal polysiloxane gel which demonstrates remarkable vertical stability, thermal conductivity, and rapid dispensing rate. The present invention is characterized by its polysiloxane polymer network formed by reaction of the components upon mixing, which enables embedding of thermally conductive fillers to further enhance the overall thermal conductivity of the gel, while not compromising in vertical stability. The thermal gel of the present invention is therefore highly suitable for application of electronics and electrical vehicle usage, which may involve high temperature and vertical positioning conditions.