Copper Foil Surface Treatment for Low-Temperature Polyvinyl Acetal Lamination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in achieving strong adhesion between a polyvinyl acetal resin film and a copper foil, which is difficult due to low reactivity under low temperature and low pressure conditions typically required for laminating these materials.
Innovation Solution
By controlling the amount of nitrogen on the treated surface of the copper foil to be between 3.0 atomic % and 20.0 atomic %, preferably with a nitrogen-containing compound like silane coupling agents, the adhesion between the copper foil and the polyvinyl acetal resin film is enhanced, allowing for effective lamination under low temperature and low pressure conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polyvinyl acetal resin film and copper foil are laminated under low temperature and low pressure conditions, then the resin film maintains its transparency and mechanical properties, but the adhesion between the copper foil and resin film is insufficient due to low reactivity
Solution Approach 1:
The copper foil surface is treated in advance with a nitrogen-containing compound before lamination to enhance reactivity. This preliminary surface treatment creates a more reactive copper surface that can form stronger chemical bonds with the polyvinyl acetal resin film under low temperature and pressure conditions, thereby improving adhesion without requiring high energy input
Solution Approach 2:
The chemical composition of the copper foil surface is modified by introducing nitrogen-containing compounds. This changes the surface parameters (chemical reactivity, surface energy) of the copper foil, enabling it to exhibit higher reactivity toward the resin film while maintaining the low temperature and pressure lamination process
2Reliability
If a nitrogen-containing compound is used to treat the copper foil surface to improve adhesion, then the chemical reactivity and adhesion are enhanced, but the manufacturing process complexity increases
Solution Approach 1:
The nitrogen-containing compound treatment serves multiple functions simultaneously: it enhances the chemical reactivity of the copper surface for better adhesion, and it can also provide corrosion resistance and surface uniformity. This multi-functionality reduces the need for separate treatment steps, thereby limiting the increase in manufacturing complexity while achieving improved adhesion
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
This method results in a laminate with improved adhesion, enabling the formation of a heating element with better visibility and efficiency, suitable for defrosters in vehicles.
Implementation Method 1
By controlling the amount of nitrogen on the treated surface of the copper foil to be between 3.0 atomic % and 20.0 atomic %, preferably with a nitrogen-containing compound like silane coupling agents, the adhesion between the copper foil and the polyvinyl acetal resin film is enhanced
Data Source
AI summary
Provided is a method for manufacturing a laminate that is excellent in adhesion between the copper foil and the resin film while using a polyvinyl acetal resin having low reactivity with the copper foil. This method includes the steps of providing a copper foil having on at least one side a treated surface on which an amount of nitrogen is 3.0 atomic % or more and 20.0 atomic % or less, and attaching or forming a polyvinyl acetal resin film on the treated surface of the copper foil to form a laminate. The amount of nitrogen is a proportion of N in a total amount of N, O, Si, P, S, Cl, Cr, Ni, Cu, Zn, Mo, Co, W, and Fe when the treated surface is subjected to elemental analysis by X-ray photoelectron spectroscopy (XPS).