Thermally Conductive Composite Silicone Sheets for Instant Adhesion
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Solution Overview
Problem
Conventional thermally conductive silicone rubber sheets face a trade-off between adhesive strength and thermal conductivity due to the thickness of adhesive layers, with thin layers improving conductivity but reducing strength, and thick layers compromising conductivity.
Innovation Solution
A thermally conductive composite silicone rubber sheet with a thermosoftening silicone resin layer on one or both sides, containing 75 to 95% thermosoftening silicone resin and 5 to 25% diphenylsiloxy group-containing organopolysiloxane, with specific viscosity and thickness, to develop adhesiveness on instantaneous contact while suppressing oil bleed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the thickness of the adhesive layer is reduced to improve thermal conductivity, then thermal conductivity is improved, but adhesive strength is reduced
Solution Approach 1:
The patent changes the chemical composition parameters of the adhesive layer by incorporating specific silicone resin components and controlling the ratio of phenyl groups to achieve both high thermal conductivity and adequate adhesive strength, rather than simply adjusting thickness
Solution Approach 2:
The adhesive layer is formulated as a composite material containing silicone resin, phenyl groups, and specific additives that work together to provide both thermal conduction and adhesion properties simultaneously
2Strength
If the thickness of the adhesive layer is increased to ensure adhesive strength, then adhesive strength is improved, but thermal conductivity is deteriorated
Solution Approach 1:
The patent modifies the chemical parameters of the adhesive layer by controlling the phenyl group content (5-25 mass%) and using specific silicone resin compositions to achieve high adhesive strength with minimal thickness (1-10 μm), thereby maintaining thermal conductivity
3Strength
If a thermosoftening silicone resin layer is added to improve adhesiveness, then adhesive strength is improved, but oil bleed occurs
Solution Approach 1:
The patent controls the molecular weight, viscosity, and chemical composition parameters of the thermosoftening silicone resin layer, specifically limiting phenyl group content to 5-25 mass% and controlling thickness to 1-10 μm, to achieve adhesiveness while preventing oil bleed
Solution Approach 2:
The patent creates a localized adhesive layer with specific chemical properties different from the bulk material, concentrating the thermosoftening resin in a thin surface layer that provides adhesion without causing oil bleed to the exterior
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 composite sheet achieves improved adhesiveness and thermal conductivity without oil bleed, reducing process time and enhancing production efficiency by adhering instantly to adherends.
Implementation Method 1
a thermosoftening silicone resin layer provided on one side or both sides of a thermally conductive silicone rubber sheet... can develop adhesiveness on instantaneous contact
Implementation Method 2
a thermally conductive silicone rubber sheet in which a polymer such as silicone is filled with a thermally conductive filler to impart thermal conductivity
Data Source
AI summary
The present invention provides a thermally conductive composite silicone rubber sheet including a thermally conductive silicone rubber sheet and a thermosoftening silicone resin layer provided on one side or both sides of the thermally conductive silicone rubber sheet and having a thickness of 0.5 to 10 µm and an absolute viscosity of 10 to 700 Pa·s at 70°C. The thermosoftening silicone resin layer includes (A) 75 to 95% by mass of a thermosoftening silicone resin in which the proportion of phenyl groups to the number of all substituents directly bonded to silicon atoms is 20 mol% or more, and (B) 5 to 25% by mass of a diphenylsiloxy group-containing organopolysiloxane represented by the following formula (1): wherein m is an integer of 3 to 5, and n is an integer of 5 to 12. Thus, a thermally conductive composite silicone rubber sheet that can develop adhesiveness on instantaneous contact while suppressing oil bleed can be provided.