Polypropylene Composition for Adhesive-Free Photovoltaic Layers
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Solution Overview
Problem
Existing photovoltaic modules face issues with costly, multilayer structures that have limited insulation resistance, are prone to hydrolysis, and exhibit high water vapor transmission rates, complicating manufacturing and risking delamination.
Innovation Solution
A polypropylene composition comprising a heterophasic copolymer with specific xylene cold soluble (XCS) fraction, melt flow rate (MFR), and Vicat softening temperature is used to create a single or multilayer element in photovoltaic modules, offering improved mechanical, thermal, and electrical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multilayer structures with adhesive layers are used to compensate for limited insulation resistance and high water vapor transmission rates, then insulation performance and water protection are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines multiple functions (insulation, water protection, mechanical strength) into a single polypropylene layer by controlling its crystallinity (30-80%) and molecular weight distribution (MWD shape parameter 1.2-3.0), eliminating the need for separate adhesive layers and simplifying the overall structure
Solution Approach 2:
The invention uses a composite polypropylene material with specific crystallinity and molecular weight characteristics to achieve multiple performance requirements simultaneously, replacing traditional multilayer composite structures
2Reliability
If multilayer structures with adhesive layers are used to improve water protection, then water vapor transmission rate is reduced, but manufacturing complexity and delamination risk increase
Solution Approach 1:
The patent integrates water protection function into the polypropylene layer itself through controlled crystallinity (30-80%) and molecular weight distribution, eliminating separate waterproofing layers and reducing manufacturing steps
Solution Approach 2:
The invention optimizes specific parameters (crystallinity 30-80%, MWD shape parameter 1.2-3.0) of the polypropylene material to achieve low water vapor transmission rate without requiring additional protective layers
3Ease of manufacture
If commercial polypropylene components with low Vicat softening temperature are used, then ease of processing is improved, but thermal stability deteriorates
Solution Approach 1:
The patent changes the molecular weight distribution parameters (MWD shape parameter 1.2-3.0) and crystallinity (30-80%) of polypropylene to achieve high Vicat softening temperature (≥140°C) while maintaining processability through controlled MFR (0.2-20.0 g/10 min)
4Strength
If rigid multilayer structures are used to provide structural support, then mechanical strength is improved, but flexibility and adhesion deteriorate
Solution Approach 1:
The patent adjusts crystallinity (30-80%) and molecular weight distribution (MWD shape parameter 1.2-3.0) to achieve optimal balance between mechanical strength and flexibility in a single polypropylene layer, eliminating the need for rigid multilayer constructions
Data Source
AI summary
The present invention is directed to a layer of an electrical device a photovoltaic module comprising at least one photovoltaic element and at least one layer comprising a polypropylene composition and to the use of a polypropylene composition for producing at least one layer of an element of a photovoltaic module.