Polyoxyalkylene Composition With Ester-Based Thixotropy for Filler Stability
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Solution Overview
Problem
The curable compositions used in thermally conductive materials for electronic components and electric vehicle batteries face issues with initial viscosity being too low and viscosity decrease over time, leading to problems like settling of the thermally conductive filler.
Innovation Solution
A composition containing a compound with a polyoxyalkylene chain and two (meth)acryloyl groups, combined with an ester-based thixotropy-imparting agent, is used to maintain initial viscosity and prevent long-term viscosity decrease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curable composition containing a compound with polyoxyalkylene chain and thermally conductive filler is used, then thermal conduction performance is improved, but viscosity decreases over time causing filler settling
Solution Approach 1:
The patent changes the chemical parameters of the composition by introducing an ester-based thixotropy-imparting agent with specific molecular structure (containing ester groups and polyether chains). This chemical parameter change transforms the viscosity characteristics of the composition, enabling it to maintain stable viscosity over time while preserving thermal conduction performance. The thixotropy agent creates a gel-like structure that prevents filler settling without significantly increasing initial viscosity.
Solution Approach 2:
The patent creates a composite material system by combining the curable composition (containing polyoxyalkylene chain compound and thermally conductive filler) with an ester-based thixotropy-imparting agent. This composite approach integrates multiple functional components: the polyoxyalkylene compound provides thermal conduction, the filler provides thermal pathways, and the thixotropy agent provides viscosity stability. The synergistic effect of this composite material resolves the contradiction between maintaining low viscosity for application and preventing filler settling over time.
2Ease of operation
If the initial viscosity of the curable composition is kept low for easy application, then ease of operation is improved, but filler settling occurs during storage
Solution Approach 1:
The patent modifies the rheological parameters of the composition by adding the ester-based thixotropy-imparting agent. This agent creates a concentration-dependent viscosity structure where the composition remains relatively flowable at low shear rates (during application) but develops higher apparent viscosity at rest (during storage). The thixotropy effect allows the composition to exhibit different viscosity characteristics under different operational conditions, resolving the contradiction between ease of application and storage stability.
Solution Approach 2:
The patent introduces dynamic viscosity characteristics to the composition through the thixotropy-imparting agent. The viscosity of the composition becomes a dynamic property that changes with time and shear history rather than remaining static. During application, the shear force temporarily reduces viscosity for easy spreading, but once applied and at rest, the viscosity recovers and increases to prevent filler settling. This dynamic behavior resolves the contradiction between low viscosity for application and high viscosity for storage 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 effectively maintains initial viscosity and prevents long-term viscosity reduction, ensuring stable performance of thermally conductive materials.
Implementation Method 1
ester-based thixotropy-imparting agent
Implementation Method 2
compound having a polyoxyalkylene chain and two (meth)acryloyl groups
Data Source
AI summary
A composition containing a compound represented by the following Formula (1):wherein R11 and R12 each independently represent a hydrogen atom or a methyl group; and R13 represents a divalent group having a polyoxyalkylene chain; andan ester-based thixotropy-imparting agent.