Solar Module Backsheet Coating for Void-Resistant Adhesion
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Solution Overview
Problem
Existing solar cell module back sheets face challenges in maintaining adhesion to substrates after pressure cooker tests and with sealant layers like EVA, leading to potential voids and reduced protection for solar cells.
Innovation Solution
A composition comprising a fluorine-containing polymer with curable functional groups and a pentamethylene diisocyanate-based curing agent is used to form a coating film that adheres well to substrates and sealant layers, even under extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coating is cured to improve adhesion to substrate and sealant layer, then protection is enhanced, but voids may form reducing effectiveness
Solution Approach 1:
The invention optimizes the NCO content parameter of the pentamethylene diisocyanate-based curing agent (0.01-0.10 mmol/g of coating solid content) to achieve balanced crosslinking. This controlled crosslinking density provides sufficient adhesion and protection while preventing excessive crosslinking that would cause internal stresses and void formation during curing and pressure cooker testing.
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 coating film exhibits excellent adhesion to both substrates and sealant layers, preventing voids and enhancing the protection of solar cells, while maintaining performance after pressure cooker tests.
Implementation Method 1
a fluorine-containing polymer containing a curable functional group and a pentamethylene diisocyanate-based curing agent
Implementation Method 2
The coating film exhibits excellent adhesion to both substrates and sealant layers
Data Source
AI summary
A composition containing a fluorine-containing polymer having a curable functional group and a pentamethylene diisocyanate-based curing agent. Also disclosed is a coating film obtained from the composition; a laminate including a substrate and a layer obtained from the composition; a back sheet for a solar cell module having a water-impermeable sheet and a coating film obtained from the composition, the coating film being formed on at least one side of the water-impermeable sheet; and a solar cell module having a water-impermeable sheet and a coating film obtained from the composition, the coating film being formed on at least one side of the water-impermeable sheet, and a sealant layer formed above the coating film.