Perfluoropolyether Gel Composition to Prevent Plasticizer Bleed-Out
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Solution Overview
Problem
Existing fluoropolyether gel compositions experience plasticizer bleed-out during heat resistance tests due to non-fluorine groups like alkenyl and SiH groups, which reduce compatibility with completely fluorinated plasticizers, leading to reliability issues.
Innovation Solution
A curable perfluoropolyether gel composition comprising perfluoropolyether compounds with and without alkenyl groups, organohydrogen polysiloxane, and a hydrosilylation reaction catalyst, preventing plasticizer bleed-out and enhancing heat resistance, chemical resistance, and adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a completely fluorinated perfluoropolyether compound is used as a plasticizer to control penetration, then penetration control is improved, but plasticizer bleed-out occurs during heat resistance tests
Solution Approach 1:
The invention changes the chemical composition parameters of the plasticizer by using a perfluoropolyether compound with specific fluorine content (70-95 mass%) rather than completely fluorinated (100%). This parameter adjustment maintains penetration control while eliminating bleed-out during heat resistance tests by achieving better compatibility with the gel matrix.
Solution Approach 2:
The invention applies local quality by having different fluorine content levels in different regions of the plasticizer molecule structure. The plasticizer contains both fluorinated regions and non-fluorinated hydrocarbon regions, creating local variations in polarity and compatibility that prevent phase separation and bleed-out while maintaining overall penetration control.
2Ease of manufacture
If non-fluorinated groups (alkenyl and SiH groups) are present for hydrosilylation reaction, then curability is improved, but compatibility with completely fluorinated plasticizer decreases causing bleed-out
Solution Approach 1:
The invention changes the fluorine content parameter of the plasticizer from 100% to 70-95%, creating a partial fluorination state. This parameter change reduces the polarity difference between the plasticizer and the gel matrix containing non-fluorinated groups, thereby improving compatibility and preventing bleed-out while maintaining curability.
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 inhibits plasticizer bleed-out during heat resistance tests, ensuring excellent heat resistance, chemical resistance, and adhesiveness, improving the reliability of electronic parts sealed with the cured product.
Implementation Method 1
a perfluoropolyether compound having at least two alkenyl groups in one molecule... an organohydrogen polysiloxane... and a hydrosilylation reaction catalyst
Implementation Method 2
a perfluoropolyether compound having no alkenyl group in a molecule... that can inhibit bleed out of a plasticizer during a heat resistance test
Data Source
Figure 1
AI summary
The present invention is a curable perfluoropolyether gel composition including the following components (A) to (D): (A) a linear perfluoropolyether compound having two or more alkenyl groups in one molecule, in an amount of 10 to 90 parts by mass; (B) a perfluoropolyether compound having no alkenyl group in a molecule, in an amount of 10 to 90 parts by mass; (C) an organohydrogen polysiloxane having two or more hydrosilyl groups in one molecule, in an effective curing amount; and (D) a hydrosilylation reaction catalyst, in a catalytic amount. This provides a curable perfluoropolyether gel composition that has excellent chemical resistance, low-temperature properties, etc. and that can inhibit bleed out of a plasticizer during a heat resistance test.