PVB Interlayer Sheet for Intrusion Resistant Safety Glazings
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Solution Overview
Problem
Current polymeric interlayer sheets used in glass laminates and solar cell modules often fail to meet the EN 356 P2A standard for penetration resistance and do not provide adequate glass adhesion, which is a critical safety aspect.
Innovation Solution
A poly(vinyl butyral) (PVB) composition with 20-26 wt% triethylene glycol di-2-ethylhexanoate plasticizer is developed, offering a PVB interlayer sheet with a Pummel value ≥1 and compressive shear strength ≥1000 psi, enhancing glass adhesion and penetration resistance in glass laminates and solar cell laminates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polymeric interlayer sheets are used to achieve penetration resistance, then intrusion resistance is improved, but glass adhesion deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters of the PVB interlayer by incorporating specific plasticizers (triethylene glycol di-2-ethylhexanoate) and adhesion promoters (metal salts such as zinc, calcium, or magnesium salts of fatty acids). This changes the molecular structure and surface properties of the PVB to simultaneously achieve both high penetration resistance and excellent glass adhesion, resolving the contradiction between these two properties.
Solution Approach 2:
The patent creates a composite interlayer material by combining PVB with plasticizers and metal salt additives. This composite formulation integrates multiple functional components: PVB provides the base polymer matrix for penetration resistance, while the plasticizer enhances flexibility and the metal salts improve adhesion to glass surfaces. The synergistic combination allows the interlayer to satisfy both penetration resistance and glass adhesion requirements.
2Strength
If thick polymeric interlayer sheets are used to improve penetration resistance, then intrusion resistance is improved, but optical clarity deteriorates
Solution Approach 1:
The patent optimizes the thickness parameter of the interlayer to a specific range (0.38 mm to 1.25 mm, preferably 0.76 mm) and adjusts the chemical composition parameters (plasticizer content at 20-26 wt%, metal salt content at 0.1-5.0 wt%) to achieve the right balance. This allows the interlayer to provide sufficient penetration resistance while maintaining optical clarity through controlled material properties that minimize light scattering and absorption.
3Reliability
If conventional interlayer materials are used to achieve glass adhesion, then safety aspects are improved, but penetration resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition by incorporating metal salts (zinc, calcium, or magnesium salts of fatty acids) as adhesion promoters in combination with PVB and plasticizers. This chemical modification enhances the interlayer's ability to bond to glass surfaces through metal-oxygen-silicon bridge formation, achieving superior glass adhesion while the overall formulation maintains high penetration resistance through the plasticized PVB matrix.
Solution Approach 2:
The patent develops a composite interlayer system where PVB provides the primary polymer matrix for penetration resistance, plasticizers enhance flexibility and bondability, and metal salt additives specifically target glass adhesion. This multi-component composite material allows each ingredient to contribute its strengths, achieving both excellent glass adhesion and high penetration resistance simultaneously.
Data Source
AI summary
Described certain plasticized poly(vinyl butyral) (PVB) interlayer sheets that may be used to produce safety glass and solar cell laminates having enhanced penetration resistance and adequate adhesion levels. In particular, the stress value of these interlayer sheets at an elongation of 120% is preferably in the range of from about 8 to about 15 N/mm2.