Laminated Glass Interlayer Film for Bubble Suppression
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Solution Overview
Problem
Laminated glass using existing interlayer films exhibits insufficient sound insulation, particularly at frequencies around 2000 Hz, and is prone to bubble formation due to increased plasticizer amounts, which can lead to decreased performance.
Innovation Solution
An interlayer film with a multi-layer structure, comprising a first layer with a polyvinyl acetal resin and a higher amount of plasticizer, and a second layer with a polyvinyl acetal resin and plasticizer, where the viscoelasticity ratio (G′(Tg+80)/G′(Tg+30) is 0.65 or higher, effectively suppressing bubble formation and enhancing sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of plasticizer is increased to improve sound insulation, then sound insulation performance is improved, but bubble formation occurs in the laminated glass
Solution Approach 1:
The interlayer film is divided into multiple layers with different plasticizer contents. The first layer contains a higher amount of plasticizer (30-80 parts by weight per 100 parts of polyvinyl acetal resin) to provide sound insulation, while the second layer contains a lower amount of plasticizer (5-30 parts by weight per 100 parts of polyvinyl acetal resin) to prevent bubble formation. This segmentation allows each layer to fulfill its specific function without compromising the overall performance.
Solution Approach 2:
Different regions of the interlayer film are assigned different plasticizer concentrations tailored to their specific requirements. The first layer positioned closer to the glass plate has higher plasticizer content for sound insulation, while the second layer has lower plasticizer content for bubble prevention. This local quality differentiation optimizes the overall performance by addressing specific functional requirements in different zones.
2Reliability
If a sound insulation layer with metal salt is used to improve sound insulation, then sound insulation is improved to some extent, but the laminated glass still provides insufficient sound insulation at around 20°C and causes bubble formation
Solution Approach 1:
The invention removes the metal salt component from the interlayer film composition. By eliminating the metal salt, the patent avoids the bubble formation issues and insufficient low-temperature sound insulation that were associated with metal salt-containing formulations. The sound insulation is achieved instead through the optimized multi-layer structure with controlled plasticizer distribution.
Solution Approach 2:
The interlayer film uses a composite multi-layer structure combining polyvinyl acetal resin with different amounts of plasticizer in each layer. This composite approach replaces the single-layer metal salt formulation with a layered structure that achieves both sound insulation and bubble prevention through the synergistic combination of layers with different compositions.
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 interlayer film significantly improves sound insulation and prevents bubble formation in laminated glass, even under severe conditions, by optimizing the viscoelastic properties and plasticizer distribution within the film layers.
Implementation Method 1
the resin film, having a glass transition temperature of Tg (° C.), has an elastic modulus of G′(Tg+80) at (Tg+80)° C. and an elastic modulus of G′(Tg+30) at (Tg+30)° C., and provides a ratio (G′(Tg+80)/G′(Tg+30)) of 0.65 or higher
Data Source
AI summary
The present invention provides an interlayer film for a laminated glass which can suppress bubble formation and bubble growth in the laminated glass. An interlayer film 1 for a laminated glass includes a first layer 2 and a second layer 3 laminated on one face 2a of the first layer 2. Each of the first layer 2 and the second layer 3 contains a polyvinyl acetal resin and a plasticizer. In the case of measuring viscoelasticity of a resin film (glass transition temperature: Tg (° C.)) formed from the first layer 2 or a resin film (glass transition temperature: Tg (° C.)) formed with 100 parts by weight of the polyvinyl acetal resin contained in the first layer 2 and 60 parts by weight of a plasticizer of triethylene glycol di-2-ethylhexanoate (3GO), the resin film has an elastic modulus of G′(Tg+80) at (Tg+80)° C. and an elastic modulus of G′(Tg+30) at (Tg+30)° C., and provides a ratio (G′(Tg+80)/G′(Tg+30)) of 0.65 or higher.