Laminated Glass Interlayer Film for Moisture-Stable Adhesion
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Solution Overview
Problem
The water content in the peripheral portion of laminated glass can increase over time, leading to a decrease in penetration resistance, as evidenced by an increase in pummel value, making the glass more susceptible to penetration in a falling ball test.
Innovation Solution
An interlayer film for laminated glass is formulated with a specific composition that maintains a higher pummel value at 0.4% water content compared to 0.9%, incorporating a thermoplastic resin and dispersants like acrylic, amine-based, or urethane-based dispersants, with controlled molecular weights and ratios, to stabilize adhesive force and prevent separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the adhesive force between glass plate and interlayer film is increased, then separation between glass plate and interlayer film is prevented, but penetration occurs due to simultaneous breaking of glass plate and interlayer film
Solution Approach 1:
The patent adjusts the water content parameter of the interlayer film to a specific range (0.8-1.5 times the water content at the time of lamination) to optimize the adhesive force. This parameter change ensures that the interlayer film maintains appropriate adhesion to prevent separation while avoiding excessive adhesion that would cause penetration during impact.
2Stability of the object's composition
If water content of peripheral portion of laminated glass increases due to long-term use, then adhesion is maintained, but penetration resistance decreases and pummel value increases
Solution Approach 1:
The patent preliminarily controls the water content of the interlayer film within a specific range before lamination and maintains it at 0.8-1.5 times the initial water content during use. This preliminary action prevents excessive water absorption that would lead to increased pummel value and reduced penetration resistance, while still allowing sufficient adhesion maintenance.
Solution Approach 2:
The patent dynamically adjusts the acceptable water content range based on the initial water content measurement. By setting the maintenance range as 0.8-1.5 times the initial water content, the patent adapts to variations in initial moisture conditions while preventing excessive water accumulation that would compromise penetration resistance.
Data Source
AI summary
Disclosed herein is an interlayer film for laminated glass whose pummel value at a water content of 0.4% is larger than that at a water content of 0.9%.