Heat-Dissipating Sheet Composition for Oil-Resistant Thermal Interfaces
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Solution Overview
Problem
Heat-generating electronic components require efficient heat radiation solutions that maintain performance in environments exposed to gasoline or engine oil, where existing heat-radiating sheets often deteriorate.
Innovation Solution
A heat-radiating sheet with a resin binder and inorganic filler, specifically silicone resin and coagulated hexagonal boron nitride, impregnated with 98% ethylene glycol antifreeze, which maintains low thermal resistance and high withstanding voltage, ensuring stability in gasoline and engine oil exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional heat-radiating sheet is used in an environment exposed to gasoline or engine oil, then the heat radiation function is provided, but the sheet deteriorates and loses its heat radiation performance
Solution Approach 1:
The heat-radiating sheet uses a composite material consisting of a silicone resin binder and coagulated hexagonal boron nitride filler. This composite structure provides both excellent heat radiation performance and high resistance to gasoline and engine oil, solving the deterioration problem while maintaining thermal conductivity.
Solution Approach 2:
The invention specifies precise compositional parameters: the silicone resin binder content is controlled at 10-50 parts by mass per 100 parts by mass of hexagonal boron nitride, and the sheet thickness is controlled at 0.05-0.50 mm. These parameter optimizations ensure both heat radiation efficiency and chemical stability in harsh environments.
2Ease of operation
If the heat-radiating sheet uses a resin binder to maintain flexibility and adhesion, then ease of handling is improved, but thermal resistance increases reducing heat radiation efficiency
Solution Approach 1:
The invention optimizes the resin binder content within a specific range (10-50 parts by mass per 100 parts by mass of filler) and controls sheet thickness (0.05-0.50 mm) to balance mechanical properties and thermal performance. This parameter optimization ensures adequate flexibility and adhesion while minimizing thermal resistance.
Solution Approach 2:
The use of silicone resin as a binder combined with coagulated hexagonal boron nitride filler creates a composite structure where the resin provides flexibility and adhesion, while the filler maintains high thermal conductivity, achieving a balance between ease of operation and heat radiation efficiency.
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 sheet achieves a 30% or less reduction in thermal resistance and a withstanding voltage of 6.0 kV or more, providing long-term tolerance against gasoline and engine oil, preventing deterioration and ensuring effective heat radiation.
Implementation Method 1
it is desired to fill an air gap at a contact interface between the heat-generating electronic component and the heat-radiating component with a heat-radiating material
Implementation Method 2
how to efficiently radiate heat generated at the time of use is an important issue
Data Source
Figure 1(a)~1(c)
Figure 2(a)~2(c)
AI summary
The present invention relates to a heat-radiating sheet (1), in which a rate of reduction (%) ((R1 - R2)/R1 × 100) of a thermal resistance (R2) (°C/W) of the heat-radiating sheet (1) as measured when tightened at a tightening torque of 6 kgf·cm by using a screw (4) after being impregnated in an antifreeze containing 98% by mass or more of ethylene glycol at a temperature of 25°C for 500 hours relative to a thermal resistance (R1) (°C/W) of the heat-radiating sheet (1) as measured when tightened at a tightening torque of 6 kgf·cm by using a screw (4) is 30% or less. In accordance with the present invention, it is possible to provide a heat-radiating sheet having high tolerance against gasoline and engine oil.