Cholesteric Resin Heat Insulating Laminated Glass
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Solution Overview
Problem
Conventional laminated glass technologies face challenges in simultaneously achieving high visible light transmittance, effective infrared radiation blocking, and flexible coloration, as increasing infrared-blocking particles reduce visible light transmittance, and adding pigments for coloration further decreases light transmission.
Innovation Solution
A heat insulating member comprising a cholesteric resin layer with controlled cholesteric regularity to reflect infrared radiation across a wide wavelength range, combined with a binder layer containing pigments, allowing for high visible light transmittance and flexible coloration without excessive reduction in visible light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the amount of particles that absorb infrared radiation is increased to block infrared radiation effectively, then infrared radiation blocking performance is improved, but visible light transmittance is reduced
Solution Approach 1:
The patent divides the infrared blocking function into two separate mechanisms: (1) a cholesteric liquid crystal layer that reflects far-infrared radiation through its helical structure, and (2) infrared-absorbing particles that absorb near-infrared radiation. This segmentation allows each component to be optimized independently, with the cholesteric layer providing broad-spectrum reflection and the particles providing targeted absorption, thereby achieving effective infrared blocking without excessive visible light attenuation.
Solution Approach 2:
The patent introduces a cholesteric liquid crystal layer as an intermediary between the glass substrate and the infrared-absorbing particles. This intermediary layer serves multiple functions: it reflects far-infrared radiation, provides structural support, and enables the integration of infrared-absorbing particles without direct contact that would compromise visible light transmission. The cholesteric structure acts as a mediator that harmonizes the conflicting requirements of infrared blocking and visible light transmission.
2Adaptability or versatility
If the amount of pigment is increased to achieve deep coloration, then color depth is improved, but visible light transmittance is reduced
Solution Approach 1:
The patent separates the coloration function from the infrared blocking function by placing pigments in a distinct layer from the cholesteric liquid crystal layer. This allows the pigments to be optimized for color depth while the cholesteric layer handles infrared reflection. The layered structure enables independent optimization of each function, achieving deep coloration without compromising visible light transmission through the infrared-blocking mechanism.
Solution Approach 2:
The patent applies different functional properties to different regions of the laminated glass structure: the cholesteric liquid crystal layer provides infrared reflection with high transparency, while the pigment-containing layer provides coloration. Each layer is locally optimized for its specific function, allowing deep coloration in the pigment layer while maintaining high visible light transmittance in the cholesteric layer.
3Loss of energy
If the amount of infrared-blocking particles is increased to block infrared radiation, then infrared radiation blocking performance is improved, but the room for coloration is limited
Solution Approach 1:
The patent segments the infrared blocking function across two mechanisms operating in different wavelength ranges: the cholesteric liquid crystal layer handles far-infrared reflection, while infrared-absorbing particles handle near-infrared absorption. This segmentation creates functional redundancy and allows flexible coloration in the pigment layer without compromising infrared blocking performance, as the cholesteric layer provides baseline infrared protection.
Solution Approach 2:
The cholesteric liquid crystal layer serves as an intermediary that enables the presence of infrared-absorbing particles and pigments without direct interference. It provides a reflective barrier that reduces the burden on particles for overall infrared blocking, thereby allowing greater freedom in particle concentration and pigment addition while maintaining infrared protection.
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 solution effectively blocks infrared radiation while maintaining high visible light transmittance and enabling flexible coloration options, overcoming the limitations of prior art technologies.
Implementation Method 1
at least one cholesteric resin layer having cholesteric regularity controlled such that, in a wavelength range of 800 nm to 2,500 nm, the cholesteric resin layer has a band of reflecting 40% or more of incident light with a wavelength width equal to or wider than 300 nm
Implementation Method 2
a binder layer containing a pigment
Data Source
AI summary
A heat insulating member including at least one cholesteric resin layer having cholesteric regularity controlled such that, in a wavelength range of 800 nm to 2,500 nm, the cholesteric resin layer has a band of reflecting 40% or more of incident light with a wavelength width equal to or wider than 300 nm; and a binder layer containing a pigment, the heat insulating member having a yellow index of 2.0 or lower.