Room Temperature Thickening Thermal Grease Composition
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Solution Overview
Problem
Current heat-conductive silicone grease compositions either lack shape retention due to high viscosity, making them difficult to coat and apply efficiently, or require refrigeration and heating steps that reduce manufacturing efficiency and introduce cure inhibition risks.
Innovation Solution
A room temperature and moisture-thickening heat-conductive silicone grease composition comprising an organopolysiloxane capped with hydroxyl groups, a silane compound, a thickening catalyst, a heat-conductive filler, and silica fine powder, which thickens without curing, allowing for easy coating and maintaining shape retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a heat-conductive silicone adhesive material or RTV heat-conductive silicone rubber composition is used to prevent sagging, then shape retention is improved, but re-workability is lost and the material becomes too hard to withstand thermal stresses
Solution Approach 1:
The patent changes the chemical composition parameters by using a specific organopolysiloxane base polymer with controlled molecular weight and structure, combined with silane compounds and catalysts in precise ratios, to achieve a material that maintains optimal hardness and flexibility after curing, enabling both shape retention and re-workability
Solution Approach 2:
The patent creates a composite heat-conductive material combining silicone base polymer, silane compounds, catalysts, and heat-conductive fillers (such as aluminum oxide or zinc oxide particles) to achieve synergistic properties where the composite structure provides both mechanical strength for shape retention and flexibility for re-workability
2Ease of repair
If a one package addition cure heat-conductive silicone composition is used to maintain re-workability and anti-sagging, then re-workability is improved, but refrigeration storage and heating/cooling steps are required which reduce manufacturing efficiency
Solution Approach 1:
The patent enables the material to self-thicken and self-cure at room temperature through the interaction of silane compounds with atmospheric moisture, eliminating the need for external refrigeration storage and heating/cooling equipment, thereby maintaining re-workability while significantly improving manufacturing efficiency
Solution Approach 2:
The patent replaces the mechanical heating/cooling system with a chemical self-thickening mechanism driven by silane-catalyzed crosslinking at room temperature, eliminating complex thermal processing equipment and reducing manufacturing complexity
3Ease of operation
If a heat-conductive silicone grease composition is designed to have low viscosity for easy coating, then ease of operation is improved, but shape retention deteriorates causing sagging
Solution Approach 1:
The patent applies a preliminary thickening action through silane-catalyzed crosslinking that occurs automatically upon contact with atmospheric moisture during the coating process, allowing the material to be applied in a low-viscosity state and then rapidly thicken to prevent sagging, achieving both easy coating and shape retention
Solution Approach 2:
The patent creates a dynamic viscosity change where the material transitions from a low-viscosity fluid state during application to a high-viscosity gel state after exposure to moisture, enabling easy coating followed by automatic shape stabilization without sagging
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 is easy to coat with low initial viscosity, remains re-workable, and provides excellent shape retention without sagging, eliminating the need for refrigeration and heating steps, while maintaining high thermal conductivity and durability.
Implementation Method 1
a silane compound having at least three silicon-bonded hydrolysable groups per molecule (C)
Implementation Method 2
a thickening catalyst (D)
Implementation Method 3
a heat-conductive filler having a thermal conductivity of at least 10 W/m·° C. (E)
Data Source
AI summary
Provided is a room temperature and humidity thickening thermo-conductive silicone grease composition with high shape retention characteristics and good workability despite a low viscosity in an initial phase. Essential components of the room temperature and humidity thickening thermo-conductive silicone grease composition of the present invention are: (A) organopolysiloxane with a viscosity of between 0.1 Pa·s and 1,000 Pa·s at 25° C. with both ends being blocked by a hydroxyl group; (B) organopolysiloxane represented by general equation (1)(R1 is independently a substituted or non-substituted monovalent hydrocarbon group, R2 is independently an alkyl group, alkoxy alkyl group, alkenyl group, or acyl group, n is an integer between 2 and 100, and a is an integer between 1 and 3); (C) a silane compound which contains at least three hydrolysable groups bonded to a silicon atom in one molecule and/or a (partial) hydrolyzate or a (partial) hydrolysis condensate thereof; (D) a thickening catalyst; (E) a thermally conductive filler with a thermal conductivity of at least 10 W/m·° C.; and (F) silica fine powder.