Thin-Film Polymer Laminated Capacitor With Low Water Absorption
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Solution Overview
Problem
Conventional thin-film polymer laminated capacitors face issues with durability and electrical performance, particularly when using polyfunctional monomers, leading to insufficient durability and electrical characteristics.
Innovation Solution
A thin-film polymer laminated capacitor structure is developed with resin thin film layers formed by polymerizing a polyfunctional monomer and a monofunctional monomer, where the monomers satisfy specific HLB value conditions to ensure adequate crosslinking and reduced water absorption, enhancing durability and electrical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyfunctional monomer is used to form resin thin film layers, then crosslinking density and electrical characteristics are improved, but water absorption increases and durability deteriorates
Solution Approach 1:
The patent combines polyfunctional monomers (for crosslinking) with monofunctional monomers (for low water absorption) to create a composite polymer resin system. This composite approach allows the resin thin film layers to achieve both high crosslinking density for electrical performance and low water absorption for durability, resolving the contradiction between these two properties.
Solution Approach 2:
The patent controls the functional group ratio between polyfunctional and monofunctional monomers to optimize the balance between crosslinking density and water absorption. By adjusting this parameter, the resin achieves sufficient crosslinking for electrical characteristics while maintaining low water absorption for durability.
2Reliability
If polyfunctional monomers are used to enhance crosslinking, then electrical characteristics improve, but shrinkage and delamination occur reducing durability
Solution Approach 1:
The patent uses a composite resin system combining polyfunctional and monofunctional monomers. The monofunctional monomer component reduces the excessive crosslinking density that causes shrinkage and delamination, while the polyfunctional monomer maintains sufficient crosslinking for electrical performance, thus resolving the contradiction between durability and compositional stability.
Solution Approach 2:
The patent creates a resin structure with heterogeneous crosslinking density through the combination of different monomers. The polyfunctional monomer regions provide localized crosslinking for electrical characteristics, while monofunctional monomer regions provide spacing to prevent excessive shrinkage and delamination, achieving local quality optimization.
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 capacitor achieves improved durability and electrical performance with reduced water absorption, suppressing shrinkage and delamination, resulting in enhanced reliability and stability.
Implementation Method 1
irradiating the monomer layer with an electron beam to cure the monomer layer so as to form a resin thin film layer
Implementation Method 2
irradiating the monomer layer with an electron beam to cure the monomer layer
Implementation Method 3
vapor-depositing a monomer in a vacuum chamber to form a monomer layer
Implementation Method 4
vapor-depositing a metal material to form a metal thin film layer
Data Source
AI summary
The present invention pertains to a thin-film polymer laminated capacitor having a structure in which a resin thin film layer and an internal electrode metal layer are alternately laminated. The resin thin film layer has a high molecular weight structure obtained through polymerization of a first monomer which is a polyfunctional monomer and a second monomer which is a monofunctional monomer. The first monomer and the second monomer satisfy at least one of conditions (a) and (b). (a) The HLB value H2 of the second monomer is less than the HLB value H1 of the first monomer. (b) By using the following manufacturing method (1), when a first polymer member formed by using only the first monomer as the monomer and a second polymer member formed by using only the second monomer as the monomer are manufactured, and the water absorption rate of each of the polymer members is measured after being left still at 40° C. for 40 hours at 95%-relative humidity, the water absorption rate of the second polymer member is lower than the water absorption rate of the first polymer member. Here, the manufacturing method (1) comprises; providing the first monomer or the second monomer as a test monomer, obtaining a mixture by mixing a photoinitiator at a proportion of 0.2±0.01 mol with respect to 100 mol of the test monomer, pouring the mixture in a round plate; and creating a disc shaped polymer member having a dimension of diameter 30 mm×depth 1 mm by irradiating, with UV, the mixture poured in the round plate in a nitrogen atmosphere at 120 W and from a distance of 250 mm until progress of polymerization stops.