Multilayer Matte-Coating Resin for Battery Packaging
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Solution Overview
Problem
Existing packaging materials for secondary battery cases face challenges with urethane resins providing good formability but poor chemical and solvent resistance, while fluorine-containing resins offer excellent chemical and solvent resistance but poor adhesive properties for printing ink, leading to issues with electrolytic solution adhesion and printing quality.
Innovation Solution
A multilayer matte-coating layer is introduced, comprising a bottom layer with a phenoxy resin and urethane resin mixture for formability and chemical resistance, and an upper layer with a fluorine-containing resin for electrolytic solution resistance and abrasion resistance, along with solid fine particles for improved sliding properties and printing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a urethane resin is used in the matte-coating layer, then formability is improved, but chemical resistance and solvent resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining urethane resin and fluorine-containing resin in a multilayer matte-coating structure. The urethane resin provides formability in the bottom layer, while the fluorine-containing resin provides chemical and solvent resistance in the upper layer, resolving the contradiction between manufacturability and reliability.
2Reliability
If a fluorine-containing resin is used in the matte-coating layer, then chemical resistance and solvent resistance are improved, but adhesive property for printing ink deteriorates
Solution Approach 1:
The patent applies local quality by placing the fluorine-containing resin specifically in the upper layer where chemical and solvent resistance is needed, while keeping the bottom layer as urethane resin which provides good adhesive properties for printing ink. This spatial differentiation resolves the contradiction between reliability and ease of manufacture.
3Device complexity
If a single-layer matte-coating is used, then device complexity is reduced, but it cannot simultaneously provide both formability and excellent chemical/solvent resistance
Solution Approach 1:
The patent applies segmentation by dividing the matte-coating layer into multiple functional layers: a bottom layer with urethane resin for formability and an upper layer with fluorine-containing resin for chemical and solvent resistance. This segmentation allows each layer to specialize in specific functions, resolving the contradiction between simplicity and comprehensive performance.
Data Source
AI summary
A molding material for package includes a matte-coating layer having excellent formability, chemical resistance, solvent resistance, electrolytic solution resistance and printing property. The molding material for package includes an outer base material layer including a heat-resistant resin; an inner sealant layer including a thermoplastic resin; a metal foil layer disposed between the outer base material layer and the inner sealant layer; and a matte-coating layer formed on a side opposite to the metal foil layer of the outer base material layer, wherein the matte-coating layer is a multilayer including a bottom layer including a resin composition including a main agent resin including a phenoxy resin and a urethane resin, a curing agent, and solid fine particles; and an upper layer including a resin composition including a fluorine-containing resin.