Polyamide Polypropylene Solar Backsheet Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional solar modules with fluoropolymer films exhibit low adhesion and inadequate electrical insulation, necessitating thick polyester films for mechanical stability and insulation, which is inefficient.
Innovation Solution
A multilayer film comprising polyamide and polypropylene layers with acid anhydride groups or functionalized polyolefins for improved adhesion, and adhesion promoter layers with copolymers to enhance bonding between layers, ensuring effective electrical insulation and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluoropolymer films are used as back cover, then weathering resistance is improved, but adhesion to sealing layer deteriorates
Solution Approach 1:
The patent introduces a polyamide layer as an intermediary between the fluoropolymer film and the sealing layer. This polyamide layer serves as a mediator that provides both weathering resistance (inheriting from fluoropolymer) and improved adhesion to the sealing layer, thereby resolving the contradiction between weathering resistance and adhesion strength.
Solution Approach 2:
The patent creates a composite structure combining fluoropolymer film and polyamide layer. This composite material integrates the weathering resistance properties of fluoropolymer with the adhesion properties of polyamide, simultaneously achieving both improved weathering resistance and adhesion to the sealing layer.
2Reliability
If fluoropolymer film is used for electrical insulation, then insulation property is improved, but film thickness must be increased
Solution Approach 1:
The patent changes the material parameter from fluoropolymer to polyamide, which has superior electrical insulation properties per unit thickness. This parameter change allows achieving the required electrical insulation level with a thinner film, thereby resolving the contradiction between insulation property and film thickness.
3Reliability
If polyamide and polypropylene layers are combined, then electrical insulation is improved, but adhesion between layers deteriorates
Solution Approach 1:
The patent introduces adhesion promoter layers as intermediaries between the polyamide and polypropylene layers. These adhesion promoters act as mediators that are compatible with both materials, providing strong interfacial bonding and resolving the adhesion problem while maintaining the electrical insulation benefits of the polyamide-polypropylene combination.
Solution Approach 2:
The patent creates a multi-layer composite structure with polyamide, adhesion promoter, and polypropylene layers. This composite design integrates the electrical insulation properties of polyamide with the mechanical properties of polypropylene, while using adhesion promoters to ensure strong interlayer bonding, thereby simultaneously achieving good electrical insulation and adhesion.
Data Source
AI summary
Multilayer films of polyamide and polypropylene which have good layer adhesion and are suitable for a back cover of a solar module are provided. In a first embodiment, the multilayer film contains in the order listed: a) a layer containing at least 35% by weight, of polyamide; c) a layer containing at least 35% by weight of a polypropylene; and e) a layer containing at least 35% by weight, of polyamide; wherein the layer c) further comprises a polypropylene having acid anhydride groups or a polypropylene compatible functionalized polyolefin having functional groups to adhere the layer c) to each of layers a) and e). In a second embodiment adhesion promoter layers are present between the respective polyamide and polypropylene layers.