Heat-Dissipating Silicone Grease Composition for Thermal Interface
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Solution Overview
Problem
Highly viscous heat dissipating greases with increased thermally conductive fillers are difficult to apply using metal screen printing processes, leading to poor coating properties and handling issues.
Innovation Solution
A heat dissipating silicone grease composition comprising 3-30% organo polysiloxane with specific dynamic viscosity, 60-96.9% thermally conductive filler, and 0.1-10% solvent, along with an optional organosilane, which can be applied using a printing process and solvent evaporation for improved thermal conductivity and coating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of thermally conductive filler is increased to improve thermal conductivity, then thermal conductivity is improved, but viscosity rises and coating properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the base grease, specifically using a silicone oil with a specific viscosity range (10-1000 cSt) and incorporating organometallic compounds at controlled concentrations (0.1-10 wt%). This parameter optimization allows the grease to maintain low viscosity even with high filler content (90-99 wt%), resolving the contradiction between thermal conductivity and coating properties
Solution Approach 2:
The patent creates a composite grease system combining silicone oil base stock with organometallic compounds (such as organotin or organosilicon compounds) and thermally conductive fillers. This composite structure synergistically improves thermal conductivity while the organometallic compounds act as dispersants to maintain low viscosity and excellent coating properties
2Reliability
If the amount of thermally conductive filler is increased to improve thermal conductivity, then thermal conductivity is improved, but handling becomes difficult
Solution Approach 1:
The patent optimizes the viscosity parameter of the silicone oil base stock to range from 10-1000 cSt, which is lower than conventional heat dissipating greases. This parameter change ensures that even with 90-99 wt% filler content, the grease remains easy to handle and apply, eliminating the need for specialized dispensing equipment
Solution Approach 2:
The organometallic compounds serve as intermediary substances that facilitate the interaction between the filler particles and base oil. These compounds (0.1-10 wt%) act as surface modifiers and lubricants, reducing friction and improving flow characteristics, thereby maintaining ease of handling despite high filler loading
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 achieves excellent thermal conductivity and coating properties, allowing for efficient and uniform application on large areas like heat sinks, even with high filler content, while maintaining processing and handling ease.
Implementation Method 1
a solvent that disperses or dissolves said component (A)
Implementation Method 2
a solvent that disperses or dissolves said component (A)
Implementation Method 3
a thermally conductive filler having a thermal conductivity of at least 10 W/(m·K)
Implementation Method 4
an organosilane or its partially hydrolyzed condensed material
Implementation Method 5
an organosilane or its partially hydrolyzed condensed material
Implementation Method 6
evaporating subsequently said solvent contained in said composition
Data Source
AI summary
A heat dissipating silicone grease composition comprising: (A) 3% to 30% by weight of an organo polysiloxane represented by the general formula, R1aSiO(4−a)/2(R1 is one or two or more groups selected from a group of saturated or unsaturated monovalent hydrocarbon groups containing one to eighteen carbon atoms, and a is a positive number defined by 1.8≦a≦2.2) having a dynamic viscosity at 25° C. of 50 mm2/s to 500,000 mm2/s; (B) 60% to 96.9% by weight of a thermally conductive filler having a thermal conductivity of at least 10 W/(m·K); and (C) 0.1% to 10% by weight of a solvent that disperses or dissolves component (A).