Adhesive Resin Composition for Battery Packaging
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Solution Overview
Problem
Existing adhesive resin compositions for packaging, particularly those used in batteries, face challenges with low solubility and uniform application due to high melting point olefin-based resins, and lack sufficient acid resistance when exposed to acidic electrolytes.
Innovation Solution
An adhesive resin composition combining an acid-modified polyolefin resin with a crosslinking agent and a solvent blend of aromatic, aliphatic, and ketone-based solvents, along with a resin component having an amino group, to enhance adhesiveness and acid resistance, allowing for uniform application and high peeling strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an olefin-based resin component with a high melting point is used, then heat resistance is improved, but solubility deteriorates and uniform application becomes difficult
Solution Approach 1:
The patent controls the melting point parameter of the olefin-based resin to be within 80-140°C, preventing excessively high melting points that would cause poor solubility. Additionally, the solvent component composition is optimized with specific ratios (aromatic solvent 50-80 parts, aliphatic solvent 10-30 parts, ketone-based solvent 5-20 parts based on 100 parts total solvent) to enhance solubility and achieve uniform application while maintaining adequate heat resistance.
Solution Approach 2:
The patent uses a composite adhesive resin composition combining multiple resin components (acid-modified polyolefin resin, olefin-based resin, and optionally amino group-containing resin) with a specifically formulated solvent system. This composite approach allows the high-melting-point olefin-based resin to provide heat resistance while the acid-modified polyolefin resin and optimized solvents ensure solubility and uniform application.
2Strength
If a crosslinking agent component is added to improve adhesiveness, then adhesion strength is improved, but the composition becomes less soluble and harder to apply uniformly
Solution Approach 1:
The crosslinking agent is incorporated into the adhesive resin composition in advance, but the actual crosslinking reaction is delayed until after application. The solvent system (particularly the aromatic and ketone-based solvents) keeps the crosslinking agent dissolved during storage and application, and crosslinking occurs subsequently during drying or curing, ensuring uniform coating before the reaction begins.
Solution Approach 2:
The patent optimizes the content of the crosslinking agent within specific ranges (1-30 parts by mass based on 100 parts of acid-modified polyolefin resin) and adjusts the solvent composition accordingly to maintain solubility. The solvent ratios are specifically controlled to prevent premature precipitation of the crosslinking agent while enabling uniform application.
3Adaptability or versatility
If the adhesive resin composition is used in battery packaging where it contacts acidic electrolyte, then applicability is improved, but acid resistance becomes insufficient
Solution Approach 1:
The patent introduces a basic substance component (such as metal hydroxides, metal oxides, or metal carbonates) to neutralize the acidic electrolyte. The content of the basic substance is controlled within specific ranges (0.1-10 parts by mass based on 100 parts of acid-modified polyolefin resin) to provide adequate acid resistance while maintaining the adhesive properties and applicability of the composition.
Solution Approach 2:
The basic substance acts as an intermediary between the acidic electrolyte and the adhesive resin matrix. It forms a protective barrier or neutralizes the acid locally, preventing direct attack on the polymer chains and preserving the adhesive's structural integrity and bonding strength in the acidic battery environment.
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 composition achieves uniform application, high adhesiveness, and robust acid resistance, making it suitable for battery packaging applications by optimizing solvent ratios and resin components for improved solubility and durability.
Implementation Method 1
the solvent component (S) contains an aromatic solvent (S1), an aliphatic solvent (S2), and a ketone-based solvent (S3)... the adhesive resin composition can be uniformly applied
Implementation Method 2
the aromatic solvent (S1) has a highest boiling point... the solvent component (S) contains the aromatic solvent (S1) in an amount of 50 parts by mass or more and 80 parts by mass or less
Implementation Method 3
a crosslinking agent component (B)... has high adhesiveness
Implementation Method 4
an adhesive resin composition comprising an acid-modified polyolefin resin component (A)... has high adhesiveness
Data Source
AI summary
Provided are an adhesive resin composition that can be uniformly applied, has high adhesiveness, and further has high strength in acid resistance, and a laminate including the same. Provided is an adhesive resin composition including an acid-modified polyolefin resin component having a melting point of higher than 80° C. and 140° C. or lower, a crosslinking agent component, and a solvent component, in which the solvent component contains an aromatic solvent, an aliphatic solvent, and a ketone-based solvent, the aromatic solvent has a highest boiling point, and the solvent component contains the aromatic solvent in an amount of 50 parts by mass or more and 80 parts by mass or less, the aliphatic solvent in an amount of 10 parts by mass or more and 30 parts by mass or less, and the ketone-based solvent in an amount of 5 parts by mass or more and 20 parts by mass or less, based on 100 parts by mass of a total amount of the solvent component.