Wedge-Shaped Interlayer Film Magnesium Gradient Penetration Resistance
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Solution Overview
Problem
Laminated glass with existing wedge-shaped interlayer films faces issues with penetration resistance due to thickness variations, leading to potential deterioration in impact resistance.
Innovation Solution
An interlayer film with specific magnesium and alkali metal/earth metal content gradients, combined with thermoplastic resin and plasticizer layers, is used to enhance penetration resistance while minimizing double image issues in head-up displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a wedge-shaped interlayer film is used to suppress double images, then the visibility of the driver is improved, but the penetration resistance deteriorates due to thickness variations
Solution Approach 1:
The patent applies local quality by creating specific regions within the interlayer film with different magnesium content concentrations. The first region (closer to the thin end) has lower magnesium content while the second region (closer to the thick end) has higher magnesium content, allowing different areas to serve different functions - maintaining penetration resistance in the thick region while managing optical properties in the thin region
Solution Approach 2:
The patent changes the chemical composition parameter by controlling magnesium content and the ratio of alkali metal/alkali earth metal to magnesium across different regions of the interlayer film. This compositional gradient allows the material to simultaneously achieve adequate penetration resistance and optimal optical performance for HUD visibility
2Strength
If the interlayer film thickness is increased to improve penetration resistance, then the impact resistance is improved, but the double image problem worsens
Solution Approach 1:
The patent divides the interlayer film into regions with different thicknesses and compositional characteristics. The wedge shape creates a thin region for optimal optical performance and a thick region for penetration resistance, with transitional regions connecting them. Each region's local composition is optimized for its specific function
Solution Approach 2:
The patent employs asymmetric design by using a wedge-shaped interlayer film with non-uniform thickness and non-uniform chemical composition. The asymmetry allows the film to satisfy conflicting requirements at different locations - thin and composition-optimized for visibility at one end, thick and resistance-optimized at the other end
Data Source
AI summary
Provided is an interlayer film for laminated glass with which the penetration resistance of laminated glass can be heightened. An interlayer film for laminated glass according to the present invention includes one end and the other end on an opposite side of the one end, the other end has a thickness larger than a thickness of the one end, the interlayer film does not contain or contains alkali metal, the interlayer film does not contain or contains alkali earth metal, and the interlayer film contains magnesium. Further in the interlayer film for laminated glass, a content of magnesium in a surface portion of a first region on the one end side of the interlayer film after heated at 150° C. for 30 minutes, a total content of alkali metal, alkali earth metal and magnesium in the surface portion of the first region on the one end side of the heated interlayer film, a content of magnesium in a surface portion of a second region on the other end side of the heated interlayer film, and a total content of alkali metal, alkali earth metal and magnesium in the first or second region of the interlayer film after heat satisfy specific relationships.