Colored Laminated Glass Interlayer With IR Reflection Against Discoloration
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Solution Overview
Problem
Conventional colored interlayer films in laminated glass discolor due to light and heat, compromising design quality and property.
Innovation Solution
An interlayer film with an infrared reflective layer and a thermoplastic resin layer containing a coloring agent, where the infrared reflective layer has specific reflection wavelengths and includes a metal sputtered layer, and the resin layer incorporates heat shielding particles and a plasticizer to suppress discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a colored interlayer film is used to achieve colored laminated glass, then design quality and design property are improved, but the film discolors due to light and heat exposure
Solution Approach 1:
An infrared reflective layer is introduced as an intermediary component between the colored resin layer and the external environment. This layer reflects infrared radiation before it reaches the coloring agent, preventing the thermal degradation that causes discoloration while allowing the color to remain visible and stable
Solution Approach 2:
The patent converts the harmful infrared radiation that causes discoloration into a beneficial reflected energy source. By positioning the infrared reflective layer to face the colored resin layer, the harmful infrared rays are reflected back, reducing heat accumulation and preventing the chemical changes that lead to discoloration
2Temperature
If an infrared reflective layer is added to enhance heat shielding property, then heat shielding performance is improved, but the structure becomes more complex
Solution Approach 1:
The infrared reflective layer serves multiple functions simultaneously: it acts as a heat shielding barrier, a protective layer for the coloring agent against infrared-induced discoloration, and contributes to the overall optical performance of the laminated glass. This multi-functionality reduces the need for additional separate components
3Reliability
If the infrared reflective layer has high reflectance at both UV and IR wavelengths, then heat shielding and discoloration prevention are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies optimized wavelength ranges (350-450 nm for UV and 800 nm+ for IR) where the infrared reflective layer achieves high reflectance. By targeting these specific parameter ranges rather than requiring uniform reflectance across all wavelengths, the manufacturing precision requirements are reduced while still achieving effective heat shielding and discoloration prevention
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 prevents discoloration from light and heat, maintaining the design quality and property of laminated glass by reflecting infrared rays and ensuring high visible light transmittance.
Implementation Method 1
an infrared reflective layer having a first maximum reflection wavelength at a wavelength of 350 nm to 450 nm, and a second maximum reflection wavelength at a wavelength of 800 nm or more
Implementation Method 2
the infrared reflective layer contains a metal sputtered layer
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of suppressing the discoloration by the light and heat in an interlayer film including a resin layer colored with a coloring agent. The interlayer film for laminated glass according to the present invention has an infrared reflective layer, and a first resin layer containing a thermoplastic resin, the first resin layer is arranged on a first surface side of the infrared reflective layer, the infrared reflective layer has a first maximum reflection wavelength at a wavelength of 350 nm to 450 nm, and a second maximum reflection wavelength at a wavelength of 800 nm or more, each of reflectance at the first maximum reflection wavelength and reflectance at the second maximum reflection wavelength is 15% or more, and the first resin layer contains a coloring agent.