PVA Resin Composition for Stable Aqueous Ceramic Green Sheets
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Solution Overview
Problem
Conventional polyvinyl alcohol resins used in ceramic green sheets with aqueous solvents suffer from sedimentation of inorganic powder over time, leading to reduced stability and performance of the slurry composition, which affects the quality of the ceramic green sheet and resulting capacitors.
Innovation Solution
A polyvinyl alcohol resin with a specific adsorption amount on barium titanate of 0.05 to 5 mg/g, a solubility parameter of 12 or greater, and functional groups such as carboxylic acid, sulfonic acid, pyrrolidone ring, amide, or amino groups in the side chain, which enhances interaction with inorganic powder and reduces sedimentation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polyvinyl alcohol resin is used with aqueous solvent, then organic solvent can be replaced for environmental reasons, but inorganic powder sediments easily over time reducing slurry stability
Solution Approach 1:
The patent modifies the polyvinyl alcohol resin by controlling its degree of saponification (80-99 mol%) and introducing specific functional groups (carboxylic acid, sulfonic acid, amide, or amino groups) to change its chemical parameters. This enables the resin to provide adequate dispersity and stability in aqueous solvent without causing inorganic powder sedimentation, thus resolving the contradiction between environmental friendliness and slurry stability.
Solution Approach 2:
The patent creates a composite system by combining polyvinyl alcohol resin with specific functional groups and inorganic powder particles. The functional groups on the resin molecule interact with the inorganic powder surface, forming a stable composite structure that prevents sedimentation while maintaining aqueous solvent compatibility, thereby solving both environmental and stability requirements.
2Ease of manufacture
If conventional polyvinyl alcohol resin is used, then production process is simple, but ceramic green sheet shows lower performance after long storage
Solution Approach 1:
The patent optimizes specific parameters of the polyvinyl alcohol resin including degree of saponification (80-99 mol%) and introduces functional groups to enhance its interaction with inorganic powder. This modified resin maintains ease of manufacture through standard polymerization processes while significantly improving the reliability and performance of ceramic green sheets during long-term storage.
3Stability of the object's composition
If polyvinyl alcohol resin with high adsorption amount on inorganic powder is used, then sedimentation is reduced, but resin may aggregate with excessive adsorption
Solution Approach 1:
The patent precisely controls the adsorption amount of the modified polyvinyl alcohol resin on inorganic powder by adjusting the degree of saponification and functional group content. This optimization ensures sufficient adsorption to prevent sedimentation while avoiding excessive adsorption that would cause resin aggregation, thereby maintaining both sedimentation resistance and dispersion uniformity.
Solution Approach 2:
The patent introduces functional groups at specific locations on the polyvinyl alcohol resin molecule (local modification) to create regions of enhanced interaction with inorganic powder. This local quality enhancement provides targeted adsorption capability that prevents sedimentation without causing overall resin aggregation, maintaining uniform dispersion.
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 resin composition produces ceramic green sheets with improved flexibility and strength, maintaining high performance even after long storage, resulting in highly reliable ceramic capacitors.
Implementation Method 1
the polyvinyl alcohol resin having an adsorption amount on the inorganic powder of 0.05 to 5 mg/g
Data Source
AI summary
The present invention provides a polyvinyl alcohol resin that enables the production of a ceramic green sheet with an aqueous solvent, reduces sedimentation of inorganic powder to impart excellent flexibility and strength to the ceramic green sheet, and enables the production of a highly reliable ceramic capacitor. Provided is a polyvinyl alcohol resin having an adsorption amount on barium titanate of 0.05 to 5 mg/g.