Hygroscopic Particles for High-Temperature Moisture Control
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Solution Overview
Problem
Existing moisture absorbing agents, such as moisture absorbing/desorbing polymers and ultrafine particles, are unsuitable for high-temperature applications in electronic devices like organic electroluminescent (organic EL) devices and solar cells due to high moisture desorption performance under high temperature conditions.
Innovation Solution
Hygroscopic particles with a crosslinked polymer containing 6.0 to 12.0 meq/g of carboxyl groups and 0.1 to 2.0 meq/g of sulfonic acid groups or sulfonate groups, where 80% or more of the carboxyl groups are neutralized to a potassium salt, are developed to maintain excellent moisture absorption and prevent desorption even at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If moisture absorbing/desorbing polymer or ultrafine particles are used to achieve high moisture desorption performance under high temperature conditions, then moisture desorption capability is improved, but they become unsuitable for electronic devices requiring durability under high temperature conditions
Solution Approach 1:
The patent changes the chemical composition parameters by introducing sulfonic acid groups and sulfonate groups in addition to carboxyl groups, and specifically neutralizing 80% or more of carboxyl groups to potassium salts. This compositional parameter change enables the material to maintain both high moisture absorption capacity and thermal stability, resolving the contradiction between moisture desorption performance and high temperature suitability
Solution Approach 2:
The patent creates a composite functional structure within the polymer by combining multiple functional groups (carboxyl groups, sulfonic acid groups, sulfonate groups) in a single material system. This composite approach allows the material to exhibit both strong moisture absorption properties and enhanced thermal stability, making it suitable for high temperature applications in electronic devices
2Productivity
If lithium chloride or calcium chloride are used to achieve great moisture pickup and high moisture absorption rate, then moisture absorption speed is improved, but they deliquesce and liquefy after absorbing moisture
Solution Approach 1:
The patent changes the chemical nature of the moisture absorbing material from simple inorganic salts to complex organic polymers with multiple functional groups. This parameter change in chemical composition allows the material to achieve high moisture absorption rates while maintaining structural stability and preventing deliquescence, as the polymer structure provides a stable framework that does not collapse upon water absorption
3Duration of action of stationary object
If silica gel or zeolite are used to achieve repeated usability through moisture adsorption/desorption, then reusability is improved, but their moisture pickups are small and they require high temperatures for regeneration
Solution Approach 1:
The patent modifies the chemical parameters of the material by incorporating multiple hydrophilic functional groups (carboxyl, sulfonic acid, sulfonate groups) with high water affinity. This increases the moisture pickup capacity significantly compared to conventional silica gel or zeolite, while the polymer structure allows for lower temperature regeneration, improving both capacity and energy efficiency
Solution Approach 2:
The patent employs a composite functional group structure within the polymer chain that combines the benefits of different functional groups. This composite approach enables the material to achieve high moisture pickup capacity similar to inorganic desiccants while maintaining the reusability advantage through lower temperature regeneration cycles
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 hygroscopic particles achieve excellent moisture absorption performance at 50° C. or higher, maintaining low humidity within a closed container and ensuring durability and transparency when incorporated into electronic device matrices.
Implementation Method 1
hygroscopic particles including a crosslinked polymer containing 6.0 to 12.0 meq/g of carboxyl groups and 0.1 to 2.0 meq/g of sulfonic acid groups and/or sulfonate groups
Data Source
AI summary
Hygroscopic particles including a crosslinked polymer containing 6.0 to 12.0 meq/g of carboxyl groups and 0.1 to 2.0 meq/g of sulfonic acid groups and/or sulfonate groups, 80% or more of the carboxyl groups being neutralized to a potassium salt.