Laminated Glass Interlayer Film Resolving Optical Strain and Damping Trade-off
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Solution Overview
Problem
Conventional laminated glass interlayer films face challenges in simultaneously suppressing optical strain and enhancing damping performance, leading to compromised sound insulation and safety in applications like automobiles.
Innovation Solution
An interlayer film with a one-layer or multi-layer structure, containing a resin with specific molecular weight distribution, glass transition temperature, and refractive index, is used between glass sheets to achieve optical strain values of 3.00 or less and damping ratios of 5.0% or more at specific resonance frequencies, utilizing a combination of materials and processing techniques to optimize optical and acoustic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional interlayer films are used to enhance damping performance, then damping ratio improves, but optical strain increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the resin within 20°C to 60°C and the tan δ value within 0.8 to 1.5. This optimization of material parameters enables the interlayer film to achieve both high damping performance (damping ratio ≥ 5.0%) and low optical strain (optical strain value ≤ 3.00), resolving the contradiction between these two properties.
Solution Approach 2:
The patent employs composite materials by formulating the interlayer film with a specific resin composition that includes polyvinyl acetate resin and polyvinyl butyral resin in controlled proportions. This composite resin system provides synergistic effects, achieving both excellent damping characteristics and optical clarity, thereby simultaneously improving damping performance while suppressing optical strain.
2Object-affected harmful factors
If conventional interlayer films are used to suppress optical strain, then optical strain decreases, but damping performance deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing the glass transition temperature (Tg) to 20°C to 60°C and the loss tangent (tan δ) to 0.8 to 1.5. These parameter changes enable the resin to provide sufficient damping (damping ratio ≥ 5.0%) while maintaining optical clarity (optical strain value ≤ 3.00), achieving both goals simultaneously rather than trading one for the other.
Solution Approach 2:
The patent applies local quality by creating an interlayer film with spatially optimized properties through controlled resin distribution and specific Tg gradients. The resin composition is designed to provide localized damping characteristics in the frequency range of 50-80 Hz while maintaining uniform optical properties across the entire film, thus achieving both low optical strain and high damping performance.
3Reliability
If high damping ratio is achieved through conventional materials, then damping performance improves, but sound insulation deteriorates
Solution Approach 1:
The patent resolves this contradiction by precisely controlling the glass transition temperature (Tg) within 20°C to 60°C and the tan δ value within 0.8 to 1.5. This optimization creates an interlayer film that achieves high damping ratio (≥ 5.0%) in the 50-80 Hz frequency range while simultaneously maintaining excellent sound insulation performance, eliminating the trade-off between these two acoustic properties.
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 effectively suppresses optical strain and enhances damping performance, improving sound insulation and safety in laminated glass, particularly in applications with low-frequency noise issues like electric vehicles.
Implementation Method 1
the first layer has a glass transition temperature of 40° C. or more and 100° C. or less, and has a tan δ at the glass transition temperature of 1.2 or more
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of suppressing the generation of an optical strain in laminated glass, and enhancing the damping performance of laminated glass. An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer or two or more-layer structure, and includes a first layer containing a resin, and when the interlayer film is arranged between two sheets of clear float glass having a thickness of 2.5 mm to obtain a laminated glass X with a size of 150 mm in length and 300 mm in width, and the obtained laminated glass X is subjected to a specific measurement of optical strain, an optical strain value is 3.00 or less, whereas when the interlayer film is arranged between two sheets of clear float glass having a thickness of 2.1 mm to obtain a laminated glass Y having a size of 950 mm in length and 1500 mm in width, and the obtained laminated glass Y is subjected to a specific measurement of damping ratio, a damping ratio at a resonance frequency of 50 Hz or more and 80 Hz or less is 5.0% or more.