Colored Laminated Glass Interlayer Composition for UV Weather Fastness
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Solution Overview
Problem
The weather fastness of resin compositions for laminated glass interlayer films containing coloring agents is insufficient for long-term applications, particularly in building materials.
Innovation Solution
A resin composition for laminated glass interlayer films is formulated with a coloring agent and an ultraviolet absorber, featuring a specific transmission spectrum that includes a light transmittance of 65% or less at 400 nm, a minimum transmittance wavelength range of 570 nm to 605 nm, and a minimum transmittance of 1% to 50% in this range, along with the use of tetraazaporphyrin and azo compounds, to enhance weather fastness while maintaining visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a coloring agent is contained in the resin composition to color the laminated glass interlayer film, then the visibility and designability are improved, but the weather fastness deteriorates due to UV ray deterioration of the resin and coloring agent
Solution Approach 1:
An ultraviolet absorber is introduced as an intermediary substance that absorbs UV rays before they can damage the resin and coloring agent. The ultraviolet absorber acts as a protective mediator, converting harmful UV energy into harmless forms while allowing the coloring agent to maintain its visibility function without undergoing photochemical degradation.
Solution Approach 2:
The harmful UV rays are converted into a beneficial effect by using the ultraviolet absorber to capture the UV energy and prevent it from causing deterioration. The UV rays that would normally degrade the coloring agent are instead absorbed and dissipated safely, transforming a harmful environmental factor into a controlled process that protects the interlayer film's integrity.
2Illumination intensity
If the light transmittance at 400 nm is reduced to improve visibility, then the contrast and designability are enhanced, but the transparency and brightness are reduced
Solution Approach 1:
The coloring properties are applied locally to specific wavelength ranges rather than uniformly across the entire spectrum. The resin composition is designed to selectively absorb or transmit light in particular wavelength bands, allowing enhanced visibility through improved contrast in certain regions while maintaining overall transparency by preserving light transmission in other regions.
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 composition achieves improved weather fastness and visibility balance by suppressing resin and coloring agent deterioration due to UV rays, maintaining transparency and appearance over time.
Implementation Method 1
an ultraviolet absorber (C)... the resin composition has, in a total light transmittance of laminated glass formed from the resin composition... a light transmittance at a wavelength of 400 nm is 65% or less
Implementation Method 2
a wavelength at which the light transmittance is minimized in a wavelength range of 420 nm or more and 720 nm or less is 570 nm or more and 605 nm or less, and a light transmittance at a wavelength at which the light transmittance is minimized in a wavelength range of 570 nm or more and 605 nm or less is 1% or more and 50% or less
Data Source
Figure 1
AI summary
A resin composition for a laminated glass interlayer film including a resin (A), a coloring agent (B), and an ultraviolet absorber (C), in which the resin composition has, in a total light transmittance of laminated glass formed from the resin composition, a transmission spectrum in which a light transmittance at a wavelength of 400 nm is 65% or less, a wavelength at which the light transmittance is minimized in a wavelength range of 420 nm or more and 720 nm or less is 570 nm or more and 605 nm or less, and a light transmittance at a wavelength at which the light transmittance is minimized in a wavelength range of 570 nm or more and 605 nm or less is 1% or more and 50% or less.