Heat-Conductive Fluorinated Curable Composition for Automotive Fluid Resistance
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Solution Overview
Problem
Heat-conductive materials based on silicone rubber face challenges with solvent resistance and uniform dispersion of heat-conductive fillers, leading to non-uniform dispersion or high viscosity when increasing filler content for improved heat conduction.
Innovation Solution
A heat-conductive fluorinated curable composition is developed, incorporating a linear polyfluoro compound, fluorinated organohydrogensiloxane, platinum group metal catalyst, heat-conductive filler, and a fluorinated organosilicon compound with a surface treating agent, allowing for high filler loading and improved oil resistance and heat conduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of heat-conductive filler is increased to improve heat conduction, then thermal conductivity is improved, but the composition does not become grease due to non-uniform dispersion of filler or has extremely high viscosity that interferes with working or shaping
Solution Approach 1:
A fluorinated organosilicon compound serving as a surface treating agent is introduced as an intermediary between the heat-conductive filler and the base composition. This intermediary improves filler dispersion uniformity and controls viscosity, enabling high filler loading (100-4,000 parts by weight per 100 parts by weight of component (A)) while maintaining grease consistency and workability
Solution Approach 2:
The invention optimizes the amount of surface treating agent within specific ranges (0.01-300 parts by weight, preferably 0.1-250 parts by weight per 100 parts by weight of component (A)) to achieve the desired balance between filler dispersion, viscosity control, and grease formation. This parameter optimization enables the composition to maintain workability even with high filler content
2Temperature
If heat-conductive materials based on silicone rubber are used, then heat resistance and electrical insulation are improved, but the materials swell or degrade by solvents such as toluene, alcohols and gasoline
Solution Approach 1:
The invention uses a fluorinated composition comprising a linear polyfluoro compound as the base polymer and a fluorinated organohydrogensiloxane as crosslinking agent, creating a composite material that combines the heat resistance of silicone rubber with the solvent resistance of fluorinated compounds. The resulting cured product maintains dimensional stability and performance in environments exposed to automobile fluids while retaining heat dissipation capabilities
3Duration of action of stationary object
If heat-conductive materials based on silicone rubber are used, then heat resistance and weather resistance are improved, but the materials are prone to swell or degrade by solvents, making them difficult to maintain performance in automobile fluid environments
Solution Approach 1:
The fluorinated composition creates a composite material system that inherits the weather resistance and heat resistance of silicone rubber while gaining resistance to automobile fluids through the fluorinated compound matrix. The crosslinked structure formed by the hydrosilylation reaction enhances dimensional stability and chemical resistance, maintaining performance in demanding automotive environments
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 cures into a product with enhanced thermal conductivity and oil resistance, suitable for use in electronic parts, particularly in automotive applications, maintaining performance even when exposed to automobile fluids.
Implementation Method 1
as long as a heat-conductive filler is pretreated with a surface treating agent, specifically a fluorinated organosilicon compound
Implementation Method 2
a fluorinated organohydrogensiloxane having at least two silicon-bonded hydrogen atoms in the molecule, and a platinum group compound
Implementation Method 3
a heat-conductive fluorinated curable composition... curing into a fluorinated cured product having a thermal conductivity of at least 1.0 W/m·K
Data Source
AI summary
A heat-conductive fluorinated curable composition is provided comprising (A) an alkenyl-containing linear polyfluoro compound, (B) a fluorinated organohydrogensiloxane having a fluorinated organic group and SiH groups, (C) a platinum catalyst, (D) a heat-conductive filler, and (E) a fluorinated organosilicon compound having a fluorinated organic group and an alkoxy group. The composition allows for heavy loading of the heat-conductive filler and cures into a cured product having improved oil resistance and thermal conductivity.