Room-Temperature Silicone Composition for Thermal Shock Resistance
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Solution Overview
Problem
Room-temperature-curable silicone compositions used in electric/electronic applications face issues with storage stability and thermal shock resistance, leading to cracks when subjected to thermal stress.
Innovation Solution
A silicone composition comprising an organopolysiloxane, an organopolysiloxane resin, an alkoxysilane, and a condensation-reaction catalyst, which cures at room temperature upon moisture exposure, providing high hardness and thermal shock stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If room-temperature-curable silicone compositions are used to form cured products, then adhesion to substrate is improved, but thermal shock resistance deteriorates causing cracks
Solution Approach 1:
The patent changes the molecular structure parameters of the organopolysiloxane by specifying precise ratios of different silicon-oxygen units (D4 content 5-50 mol%, D3 content 10-40 mol%, D2 content 5-30 mol%, D1 content 0-10 mol%). This parameter optimization allows the cured product to achieve both good adhesion and high thermal shock resistance by balancing the polymer chain flexibility and crosslinking density.
Solution Approach 2:
The patent creates a composite cured product by combining multiple organopolysiloxane components with different molecular structures and properties. The synergistic effect of D1, D2, D3, and D4 units with distinct characteristics produces a material that simultaneously achieves adhesion to substrate and resistance to thermal shock, resolving the contradiction between these two properties.
2Ease of operation
If conventional room-temperature-curable silicone compositions are used, then curing at room temperature is achieved, but storage stability deteriorates
Solution Approach 1:
The patent optimizes the molecular weight and structural parameters of the organopolysiloxane to achieve a balance between reactivity and stability. The specific compositional ratios (D1-D4 units) control the rate of moisture-curing reaction while maintaining stability during storage, allowing room-temperature curing without premature reaction or degradation.
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 exhibits excellent storage stability and forms a cured product with high hardness and improved thermal shock resistance, enhancing the reliability of electric/electronic apparatus.
Implementation Method 1
curing at room temperature by contacting moisture in air
Implementation Method 2
alkoxysilyl-containing groups... partial hydrolysis and condensation product
Implementation Method 3
a condensation-reaction catalyst
Data Source
AI summary
The present invention relates to a room-temperature-curable silicone composition comprising: (A) an organopolysiloxane having alkoxysilyl-containing groups at both molecular terminals, (B) an organopolysiloxane resin, (C) an alkoxysilane, and (D) a condensation-reaction catalyst. The room-temperature-curable silicone composition exhibits good store stability and can form a cured product exhibiting high hardness and good thermal shock stability.