Battery Case Adhesive Composition for Low-Temperature Lamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adhesives used in packaging materials for lithium batteries face challenges in achieving both low-temperature lamination process adhesion and heat resistance, which are crucial for improving productivity and durability.
Innovation Solution
An adhesive composition comprising a crystalline modified olefin polymer, an acid anhydride monomer with a ring structure and multiple acid anhydride groups, and a cross-linking agent, such as an epoxy compound, is used to enhance adhesion and heat resistance through a cross-linking reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an adhesive composition containing maleic anhydride-modified propylene-butene copolymer, epoxy resin, and 1,2,3,6-tetrahydrophthalic anhydride is used, then heat resistance is improved, but adhesion during low-temperature lamination process deteriorates
Solution Approach 1:
The invention changes the chemical parameters of the adhesive composition by specifying precise component ratios: maleic anhydride-modified propylene-butene copolymer (5-20 mass%), epoxy resin (70-85 mass%), and 1,2,3,6-tetrahydrophthalic anhydride (5-20 mass%). This parameter optimization enables the adhesive to achieve both low-temperature lamination adhesion and heat resistance by balancing the reactive components for cross-linking with the base polymer for initial bonding
Solution Approach 2:
The invention uses a composite adhesive system combining three distinct components: maleic anhydride-modified propylene-butene copolymer (provides low-temperature adhesion), epoxy resin (provides cross-linking and heat resistance), and 1,2,3,6-tetrahydrophthalic anhydride (provides additional cross-linking and thermal stability). The synergistic interaction of these composite materials resolves the contradiction between low-temperature bonding and high-temperature performance
2Productivity
If a low-temperature lamination process is implemented to improve productivity, then manufacturing efficiency is improved, but adhesion performance deteriorates
Solution Approach 1:
The invention optimizes the adhesive composition parameters to enable effective bonding at lower temperatures. The maleic anhydride-modified propylene-butene copolymer (5-20 mass%) provides excellent low-temperature adhesion, while the controlled ratio of epoxy resin and anhydride ensures sufficient cross-linking even at reduced lamination temperatures, thus maintaining adhesion strength while improving productivity
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 adhesive composition achieves excellent adhesion during low-temperature lamination and improved heat resistance, making it suitable for packaging materials, particularly for battery cases.
Implementation Method 1
Such an adhesive composition is cured by a cross-linking reaction between the crystalline modified olefin polymer, the acid anhydride monomer, and the cross-linking agent
Implementation Method 2
The acid anhydride monomer has two or more acid anhydride groups. Therefore, in the cross-linking reaction, the cross-link density is improved
Data Source
Figure 1~2B
Figure 3~4
AI summary
An adhesive composition includes a crystalline modified olefin polymer, an acid anhydride monomer, and a cross-linking agent. The crystalline modified olefin polymer is obtained by modifying a crystalline α-olefin polymer having 2 to 20 carbon atoms with a monomer having a functional group capable of reacting with an epoxy group or an oxazoline group. The acid anhydride monomer has a ring structure and two or more acid anhydride groups. The cross-linking agent includes an epoxy compound and/or an oxazoline compound.