Solar Cell Backsheet Coating for Blocking Resistance
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Solution Overview
Problem
Conventional solar cell backsheets suffer from inadequate blocking resistance when wound into a roll configuration, leading to unwanted adhesion between contacting surfaces, which can interfere with separation and cause coating film adherence issues.
Innovation Solution
A solar cell backsheet with a cured coating film formed from a coating material containing a curable functional group-containing fluorinated polymer and an acrylic polymer, where the acrylic polymer includes alkyl (meth)acrylate-based polymerization units and specific curable functional group-containing monomers, providing improved blocking resistance and adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional backsheet is wound into a roll configuration, then storage and transport are facilitated, but unwanted adhesion occurs between contacting surfaces leading to blocking
Solution Approach 1:
The patent applies composite materials by combining a fluorinated polymer coating with an acrylic polymer coating on the backsheet surface. This composite coating structure provides both the necessary surface properties for roll storage and enhanced blocking resistance, resolving the contradiction between ease of operation and reliability.
Solution Approach 2:
The patent changes the surface parameters of the backsheet by applying specific polymer coatings with controlled thickness and composition. This modifies the surface energy and friction characteristics to prevent adhesion during rolling, while maintaining the structural integrity needed for reliable blocking resistance.
2Reliability
If a resin sheet is used to provide electrical insulation and water impermeability, then these protective functions are achieved, but the weight of the backsheet increases
Solution Approach 1:
The patent uses thin film polymer coatings instead of thick resin sheets to provide the necessary protective functions. The fluorinated polymer and acrylic polymer form thin films that deliver electrical insulation and water impermeability while minimizing weight, resolving the contradiction between reliability and weight.
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 solution exhibits excellent blocking resistance and adherence, preventing unwanted adhesion when wound, while also offering enhanced weathering resistance, electrical insulation, and flame retardancy, along with weight reduction benefits.
Implementation Method 1
a cured coating film obtained by the crosslinking of a coating material that contains a specific fluorine-containing polymer and an acrylic polymer
Data Source
AI summary
An object of the present invention is to provide a solar cell backsheet that exhibits an excellent blocking resistance. The present invention is a backsheet for a solar cell module, comprising a substrate sheet and a cured coating film formed from a coating material that contains a curable functional group-containing fluorinated polymer and an acrylic polymer.