Polysiloxane Composition for Low-Temperature Curing Films
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Solution Overview
Problem
Existing polysiloxane compositions require high-temperature curing, have inadequate storage stability, high dielectric constants, insufficient mechanical strength, and poor electrical characteristics.
Innovation Solution
A polysiloxane composition comprising polysiloxane, ionic liquid, acid, and solvent, with a specific mixing ratio of ionic liquid to acid, is applied to a substrate and cured through heating or light irradiation, or a combination thereof.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature curing is used to cure polysiloxane, then the curing reaction proceeds rapidly, but the storage stability deteriorates and mechanical strength decreases
Solution Approach 1:
The patent changes the chemical parameters of the curing system by introducing a specific acid catalyst (carboxylic acid or sulfonic acid) and ionic liquid combination, allowing the curing reaction to proceed at lower temperatures (80-150°C) while maintaining adequate curing speed and improving storage stability
Solution Approach 2:
The patent uses ionic liquid as an intermediary substance that facilitates the acid-catalyzed curing reaction at lower temperatures, enabling the polysiloxane to cure effectively without requiring high-temperature processing
2Productivity
If high-temperature curing is used, then the curing reaction is rapid, but the dielectric constant increases
Solution Approach 1:
The patent changes the thermal processing parameters by using low-temperature curing (80-150°C) with acid catalyst and ionic liquid, which prevents the formation of dense crosslinked structures that would increase dielectric constant, thereby achieving lower dielectric constant (2.5-3.0) while maintaining adequate curing speed
3Productivity
If high-temperature curing is used, then the curing reaction is rapid, but the mechanical strength decreases
Solution Approach 1:
The patent changes the curing temperature parameters to a lower range (80-150°C) with extended curing time, using acid catalyst and ionic liquid to maintain reaction efficiency, which produces a more uniform crosslinked structure and improves mechanical strength (flexibility and adhesion) compared to high-temperature curing
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 allows for low-temperature curing, improved storage stability, reduced dielectric constant, enhanced mechanical strength, and superior electrical characteristics of the cured film.
Implementation Method 1
the combination of an ionic liquid and an acid catalyst, enables the composition to be cured at a lower temperature
Implementation Method 2
heat treatment is performed to decompose and volatilize organic components, thereby forming a large number of pores
Implementation Method 3
subjecting the film to heating, light irradiation, or a combination thereof
Data Source
AI summary
A polysiloxane composition includes: (I) a polysiloxane, (II) an ionic liquid, (III) an acid, and (IV) a solvent, in which the mixing ratio ((II)/(III)) of the ionic liquid (II) to the acid (III) is 0.001 to 0.09 at an equivalent ratio.