Vinyl-Silane Polyolefin Encapsulant for Higher Crosslinking Stability
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Solution Overview
Problem
Polyolefin elastomers (POE) encapsulants for solar cells face issues with lower crosslinking degrees, leading to bubble formation and reduced bonding stability, particularly in EVA-POE-EVA three-layer encapsulants due to differences in crosslinking rates and degrees.
Innovation Solution
A polyolefin composition containing a modified polyolefin with a vinyl silane group, incorporating terminal double bonds and a silane compound with two or more vinyl groups, enhances crosslinking through reactions with crosslinking agents, maintaining optical and insulating properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If POE encapsulants are used to provide superior insulation and moisture barrier properties, then optical properties and insulating properties are improved, but crosslinking degree is reduced leading to bubble formation and reduced bonding stability
Solution Approach 1:
The patent introduces vinyl silane groups onto the polyolefin backbone, fundamentally changing the chemical structure to enable crosslinking reactions. This parameter change in molecular structure allows POE to achieve high crosslinking degrees while maintaining its inherent insulation and moisture barrier properties
Solution Approach 2:
The patent creates a composite structure by combining polyolefin base polymer with grafted vinyl silane groups. This composite material approach allows the POE to simultaneously exhibit the insulation properties of polyolefin and the crosslinking capability of silane groups, resolving the contradiction between maintaining material properties and achieving crosslinking
2Reliability
If EVA-POE-EVA three-layer encapsulants are used to combine advantages of both materials, then insulation properties are improved, but interlayer delamination occurs due to differences in crosslinking rate and degree between EVA and POE
Solution Approach 1:
By grafting vinyl silane groups onto POE, the patent changes the crosslinking mechanism of POE to match EVA's crosslinking behavior. This parameter change in crosslinking kinetics enables synchronized crosslinking between EVA and POE layers, preventing interlayer delamination while maintaining the three-layer structure's insulation advantages
3Stability of the object's composition
If crosslinking degree of POE encapsulants is enhanced to improve bonding stability, then manufacturing stability is improved, but optical properties may be compromised
Solution Approach 1:
The patent applies vinyl silane grafting locally at the molecular level on the polyolefin backbone rather than using bulk crosslinking agents. This localized modification enables crosslinking at the molecular level while maintaining the overall optical transparency of the encapsulant material, as the grafting does not create large-scale structural changes that would scatter light
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 modified polyolefin composition achieves improved crosslinking, stabilizing module manufacturing by reducing bubble formation and delamination, enhancing the durability and stability of solar cell modules.
Implementation Method 1
a modified polyolefin containing a vinyl silane group, and thus exhibit improved degree of crosslinking
Data Source
AI summary
The present invention relates to a polyolefin composition wherein the polyolefin composition of the present invention includes a modified polyolefin containing a vinyl silane group, and may thus improve the degree of crosslinking, and when the polyolefin composition of the present invention is used for manufacturing an encapsulant film, improved degree of crosslinking may be achieved while maintaining optical properties and insulating properties.