Electrolytic Capacitor Seal Chemistry for High-Temperature Moisture Resistance
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Solution Overview
Problem
Capacitors deteriorate quickly in high-temperature environments due to sealing member degradation, leading to increased moisture transmission and reduced humidity resistance, which affects their performance and lifetime.
Innovation Solution
Incorporating a lipid-soluble sealing member deterioration preventing agent dissolved in a lipophilic solvent within the electrolytic solution, which permeates the sealing member to prevent oxidation and moisture transmission, maintaining the capacitor's integrity and extending its lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rubber sealing member is used to seal the body case, then sealing performance is achieved, but the sealing member deteriorates in high-temperature environments leading to increased moisture transmission
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing member by incorporating specific antioxidants (such as vitamin E, vitamin C, or their derivatives) at controlled concentrations (0.1-25% by weight). This parameter modification enables the sealing member to maintain its sealing performance and resist deterioration even in high-temperature environments up to 150°C, thereby extending its service life while preserving reliability.
Solution Approach 2:
The patent creates a composite sealing member material by combining rubber base material with antioxidant additives. This composite structure integrates the sealing properties of rubber with the protective properties of antioxidants, resulting in a material that simultaneously achieves effective sealing and enhanced resistance to high-temperature deterioration, thus resolving the contradiction between sealing performance and service life.
2Reliability
If antioxidant is added to suppress oxidation reactions, then sealing member deterioration is reduced, but the antioxidant is consumed and depleted over time
Solution Approach 1:
The patent applies preliminary action by pre-loading the sealing member with antioxidant substances before the deterioration process begins. The sealing member is impregnated with antioxidants (such as lipid-soluble vitamins) in advance, creating a reservoir that will gradually release and suppress oxidation reactions during the service period. This preliminary preparation ensures that the sealing member has built-in protection against oxidation from the start of its service life.
Solution Approach 2:
The patent implements self-service by enabling the sealing member to automatically replenish its antioxidant supply from the electrolytic solution. As the antioxidant in the sealing member is consumed by suppressing oxidation, additional antioxidant diffuses from the electrolytic solution into the sealing member, maintaining the antioxidant concentration and protective effect throughout the capacitor's operational life without requiring external intervention.
3Volume of moving object
If the sealing member is made thinner to reduce size, then compactness is improved, but moisture transmission increases due to reduced effective thickness
Solution Approach 1:
The patent changes the chemical composition parameters of the sealing member by incorporating antioxidants and hydrophobic substances. This modification alters the permeability characteristics of the sealing material, enabling it to maintain low moisture transmission even when the sealing member thickness is reduced. The chemical parameter changes compensate for the reduced physical barrier thickness, allowing compact design without sacrificing moisture resistance.
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 solution effectively suppresses sealing member deterioration, enhancing the capacitor's humidity resistance and extending its lifetime by reducing moisture transmission, even in high-temperature conditions.
Implementation Method 1
The sealing member deterioration preventing agent supplied by the supplying portion to the sealing member permeates the sealing member
Implementation Method 2
The sealing member deterioration preventing agent supplied by the supplying portion to the sealing member permeates the sealing member
Implementation Method 3
when a polymer such as rubber is exposed to the energy of heat or light in the presence of oxygen as in air, the generation of a radical may trigger a chain of oxidation reactions and this leads to degraded physical properties
Implementation Method 4
The liquid preparation has a lipid-soluble sealing member deterioration preventing agent dissolved in a lipophilic solvent
Data Source
AI summary
A capacitor includes a capacitor element having a predetermined liquid preparation held between a pair of electrodes facing each other across a separator, a body case for housing the capacitor element, and a sealing member made of rubber for sealing seals the body case. A supplying portion is provided in contact with the sealing member to supply the liquid preparation held in the capacitor element to the sealing member. The liquid preparation has a lipid-soluble sealing member deterioration preventing agent dissolved in a lipophilic solvent. The sealing member deterioration preventing agent supplied by the supplying portion to the sealing member permeates the sealing member. The ratio by weight of the sealing member deterioration preventing agent in the sealing member to the sealing member is 0.1% by weight to 25% by weight.