Matte Coat Layer Resin Composition for Battery Packaging
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Solution Overview
Problem
Resins used in matte coat layers for packaging materials face challenges in chemical resistance and solvent resistance for secondary battery cases, leading to potential electrolyte adhesion and print ink adherence issues, affecting the quality and appearance of the packaging material.
Innovation Solution
A molding packaging material with a matte coat layer composed of a resin composition containing a phenoxy resin, a urethane resin, and solid fine particles, optimized with a specific mass ratio and particle size, providing improved formability, chemical resistance, solvent resistance, and printability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a urethane-based resin is used in the matte coat layer, then formability is improved, but chemical resistance and solvent resistance deteriorate
Solution Approach 1:
The patent applies composite materials by combining urethane-based resin and acrylic resin in the matte coat layer. The urethane-based resin provides flexibility and formability, while the acrylic resin contributes chemical resistance and solvent resistance. This composite approach resolves the contradiction by integrating the strengths of both materials to achieve balanced performance.
Solution Approach 2:
The patent employs parameter changes by adjusting the mass ratio of urethane-based resin to acrylic resin within specific ranges (0.3-2.0, preferably 0.5-1.5). By optimizing these compositional parameters, the matte coat layer achieves both good formability and adequate chemical/solvent resistance, resolving the contradiction through precise parameter control.
2Reliability
If a fluorine-based resin is used in the matte coat layer, then chemical resistance and solvent resistance are improved, but print ink adherence deteriorates
Solution Approach 1:
The patent uses composite materials by combining acrylic resin with urethane-based resin instead of fluorine-based resin. The acrylic resin provides good print ink adherence while the urethane-based resin adds flexibility. This composite approach achieves both printability and adequate chemical/solvent resistance without the adherence problems associated with fluorine-based resins.
Solution Approach 2:
The patent applies parameter changes by controlling the mass ratio of acrylic resin to urethane-based resin within specific ranges (0.5-2.0, preferably 0.8-1.2). This optimization ensures sufficient print ink adherence while maintaining chemical and solvent resistance, resolving the contradiction through parameter adjustment.
3Reliability
If the matte coat layer is made highly resistant to electrolytes, then prevention of electrolyte adhesion is improved, but printability may be affected
Solution Approach 1:
The patent applies composite materials by combining acrylic resin and urethane-based resin in the matte coat layer. This combination provides sufficient electrolyte resistance to prevent adhesion of battery electrolytes while maintaining good printability for characters and barcodes, resolving the contradiction between chemical resistance and printability.
Data Source
AI summary
A molding packaging material including a matte coat layer having excellent formability, chemical resistance, solvent resistance, and printability is provided. The molding packaging material 1 includes an outer base material 13 made of a heat-resistant resin, an inner sealant layer 16 made of a thermoplastic resin, a metal foil layer 11 arranged between the outer base material 13 and the inner sealant layer 16, and a matte coat layer 14 formed on one side of the outer base material opposite to the other side thereof to which the metal foil layer 11 is arranged. The matte coat layer 14 is made from a resin composition containing a base compound resin including a phenoxy resin and a urethane resin, a curing agent, and solid fine particles.