Thermally Conductive Silicone Composition for Polypropylene Adhesion
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Solution Overview
Problem
Conventional thermally conductive members used in lithium-ion battery modules exhibit weak adhesive force to polypropylene, leading to peeling issues and compromised thermal conductivity.
Innovation Solution
A thermally conductive composition comprising an organopolysiloxane with alkenyl groups, a hydrogenorganopolysiloxane with hydrosilyl groups, a thermally conductive filler, and a polysiloxane compound with alkyl groups, which reacts to form a cured product with enhanced adhesive force and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional thermally conductive members are used with polypropylene housing, then weight reduction and cost reduction are achieved, but adhesive force is insufficient causing peeling failures
Solution Approach 1:
The patent modifies the chemical composition parameters of the thermally conductive member by incorporating specific silane compounds (alkoxysilane with long-chain alkenyl groups having 8-18 carbon atoms) into the polysiloxane base. This chemical parameter change enhances the adhesive force to polypropylene surfaces, preventing peeling failures while maintaining the lightweight and cost-effective polypropylene housing structure.
Solution Approach 2:
The patent creates a composite thermally conductive material system combining polysiloxane base resin with specific silane coupling agents and thermally conductive fillers. This composite structure provides multi-functional properties: the polysiloxane matrix ensures thermal conductivity, while the silane compounds provide adhesive bonding to polypropylene, resolving the contradiction between adhesion strength and reliability in vibration environments.
2Strength
If thermally conductive member with certain stickiness is used, then it adheres to adherends and prevents shifting, but vibration may cause peeling off resulting in loss of thermally conductive properties
Solution Approach 1:
The patent optimizes the adhesive parameter by selecting alkoxysilane compounds with specific long-chain alkenyl groups (8-18 carbon atoms). This parameter optimization creates an adhesive force that is sufficient to prevent shifting during assembly but not so strong that it causes peeling under vibration, thereby maintaining thermal conductivity reliability in dynamic environments.
Solution Approach 2:
The silane compounds act as intermediary substances between the thermally conductive member and the polypropylene housing. These intermediaries provide controlled adhesion that allows the member to remain in place during assembly while permitting controlled movement during vibration, preventing peeling failures and maintaining consistent thermal contact.
3Ease of operation
If conventional thermally conductive composition is used, then it can fill arbitrary gaps between heating element and heat sink, but adhesive force to polypropylene is weak leading to peeling
Solution Approach 1:
The patent develops a composite thermally conductive composition that combines the gap-filling capability of fluid polysiloxane-based materials with the adhesive properties of silane coupling agents. The composite structure allows the material to flow into arbitrary gaps during assembly while the silane components provide strong bonding to polypropylene surfaces, preventing peeling failures.
Solution Approach 2:
The patent modifies the compositional parameters of the thermally conductive material by incorporating specific ratios of polysiloxane, silane compounds, and fillers. This parameter optimization maintains the fluidity needed for gap filling while ensuring sufficient adhesive force to polypropylene, resolving the contradiction between ease of application and bonding strength.
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 with improved adhesiveness and thermal conductivity, effectively addressing the peeling issues and maintaining heat dissipation efficiency in battery modules.
Implementation Method 1
a thermally conductive composition comprising (A) an organopolysiloxane containing at least two alkenyl groups, (B) a hydrogenorganopolysiloxane containing at least two hydrosilyl groups, (C) a thermally conductive filler, and (D) a polysiloxane compound containing at least one alkyl group having 4 or more carbon atoms
Implementation Method 2
it has been found that a conventionally used thermally conductive member has weak adhesive force to the polypropylene and were prone to cause failures such as peeling
Implementation Method 3
a cured product formed by filling a curable thermally conductive composition between a heating element and a heat sink and then curing it has been used as a thermally conductive member that transfers heat generated from the heating element to the heat sink
Data Source
AI summary
The present invention provides a thermally conductive composition comprising: (A) an organopolysiloxane containing at least two alkenyl groups, (B) a hydrogenorganopolysiloxane containing at least two hydrosilyl groups, (C) a thermally conductive filler, and (D) a polysiloxane compound containing at least one alkyl group having 4 or more carbon atoms. According to the present invention, it is possible to provide the thermally conductive composition capable of forming a thermally conductive member having an excellent thermally conductive property and high adhesive force to polypropylene.