Interlayer film for laminated glass, and laminated glass
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Solution Overview
Problem
Conventional laminated glass with heat shielding performance experiences a deterioration in sound insulating properties at relatively low temperatures due to variations in ambient temperature.
Innovation Solution
An interlayer film for laminated glass with a three or more-layer structure, comprising specific layers with varying glass transition temperatures and containing heat shielding particles, which enhances sound insulation by maintaining performance in low temperature regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional interlayer film with heat shielding particles is used, then heat shielding performance is improved, but sound insulating property deteriorates in low temperature region
Solution Approach 1:
The interlayer film is divided into multiple layers with different glass transition temperatures. The first layer (with lower Tg) maintains flexibility and sound insulation at low temperatures, while the second layer (with higher Tg) provides heat shielding performance. This segmentation allows each layer to optimize its function without compromising the other.
Solution Approach 2:
The patent changes the glass transition temperature parameter of different layers to solve the contradiction. By setting the first layer's Tg below -30°C and the second layer's Tg above 0°C, the film maintains appropriate flexibility and damping characteristics across different temperature conditions, ensuring both sound insulation and heat shielding performance.
2Temperature
If interlayer film with high heat shielding performance is used, then solar transmittance is reduced, but sound insulating property varies with ambient temperature
Solution Approach 1:
The patent uses a composite structure combining two different resin materials with distinct glass transition temperatures. This composite approach allows the interlayer film to simultaneously achieve stable sound insulation properties across temperature ranges and effective solar transmittance control through the heat shielding particles in the second layer.
3Ease of manufacture
If single-layer interlayer film structure is used, then manufacturing is simplified, but performance consistency across temperature ranges is poor
Solution Approach 1:
The interlayer film is segmented into two distinct layers, each optimized for specific temperature ranges and functions. This segmentation improves performance consistency across temperature ranges while maintaining manufacturability through established lamination processes.
Solution Approach 2:
Each layer is assigned different local qualities (glass transition temperatures) suitable for its specific function. The first layer has lower Tg for low-temperature flexibility, while the second layer has higher Tg for heat shielding, allowing each region of the film to perform optimally under different conditions.
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 maintains a high sound insulating property in a temperature range of -10°C to 10°C, with a secondary resonance frequency difference of 60 Hz or more and a loss factor of 0.25 or more, while maintaining a solar transmittance of 50% or less.
Implementation Method 1
a loss factor at 20°C of the laminated glass X is 0.25 or more
Implementation Method 2
enhancing the sound insulating property of laminated glass
Implementation Method 3
containing heat shielding particles, which enhances sound insulation by maintaining performance in low temperature regions
Data Source
Figure 1~3
Figure 4
AI summary
Provided is an interlayer film for laminated glass capable of enhancing the sound insulating property of laminated glass in a relatively low temperature region. An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer structure or a two or more-layer structure, and when the interlayer film is sandwiched between two sheets of green glass having a thickness of 2 mm to obtain a laminated glass X with a size of 25 mm long × 300 mm wide, an absolute value of difference between a secondary resonance frequency of the laminated glass X before irradiation with xenon light and a secondary resonance frequency of the laminated glass X after irradiation with xenon light determined by a specific xenon light irradiation test is 60 Hz or more, a loss factor at 20°C of the laminated glass X is 0.25 or more, and a solar transmittance of the laminated glass X is 50% or less.