Phosphonium Catalyst Low-Temperature Epoxy Curing
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Solution Overview
Problem
Epoxy resin compositions face issues with low temperature curability and storage stability due to premature curing, leading to viscosity changes and deterioration in mechanical, electrical, and chemical properties of molded products.
Innovation Solution
A phosphonium ion-containing compound is used as a curing catalyst that catalyzes epoxy resin curing at low temperatures while maintaining high storage stability, ensuring catalytic activity only at desired temperatures and minimizing viscosity changes within specific time and temperature ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a curing catalyst (triphenylphosphine and 1,4-benzoquinone adduct) is used to catalyze curing at low temperatures, then low temperature curability is improved, but storage stability deteriorates due to premature curing
Solution Approach 1:
The curing catalyst is divided into two separate components: a phosphonium salt and a compound with carbonyl groups. These components are stored separately and only mixed immediately before use, preventing premature catalytic activity during storage while enabling low-temperature curing when combined. This segmentation resolves the contradiction by spatially separating the catalytic function from the storage state.
Solution Approach 2:
The phosphonium salt is prepared in advance and stored in a stable form that does not exhibit catalytic activity. When needed, it is combined with the carbonyl compound to activate the catalytic function. This preliminary preparation of inactive components that are activated only when needed allows low-temperature curability without compromising storage stability.
2Productivity
If a curing catalyst is used to promote curing reaction, then curing speed is improved, but viscosity control deteriorates due to premature curing
Solution Approach 1:
The catalytic system is segmented into two inactive components (phosphonium salt and carbonyl compound) that are stored separately. This prevents unwanted catalytic activity that would cause viscosity changes during storage, while enabling rapid curing when the components are mixed, thus resolving the contradiction between curing speed and viscosity stability.
Solution Approach 2:
The phosphonium salt acts as a latent catalyst that requires the carbonyl compound as an intermediary to become active. This intermediary mechanism allows the system to maintain stability during storage (when the intermediary is absent) while achieving fast curing when the intermediary is introduced, resolving the contradiction between curing speed and composition stability.
3Productivity
If a curing catalyst exhibits high catalytic activity, then curing efficiency is improved, but handling performance deteriorates due to unintended catalytic activity
Solution Approach 1:
The high-activity catalytic system is segmented into two separate components that are stable when stored individually. The phosphonium salt and carbonyl compound can be handled separately without risk of unintended catalytic activity, yet when combined they provide high curing efficiency. This segmentation resolves the contradiction between curing efficiency and handling performance.
Solution Approach 2:
The catalytic activity parameter is changed from being continuously active to being conditionally active only when both components are present. The phosphonium salt in itself has negligible catalytic activity, but upon contact with the carbonyl compound, it becomes highly active. This parameter change allows efficient curing while maintaining ease of handling during storage and transport.
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 phosphonium ion-containing compound enables low-temperature curability and high storage stability, preventing premature curing and maintaining the integrity of mechanical, electrical, and chemical properties of molded products.
Implementation Method 1
the curing catalyst may include the phosphonium ion-containing compound as set forth above
Data Source
AI summary
The present invention relates to a compound containing phosphonium ion of a chemical formula 1, an epoxy resin composition containing the same, and a device manufactured by using the same.