Cholesteric Liquid Crystal Recycling via Solvent Extraction
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Solution Overview
Problem
The high cost and environmental unfriendliness of cholesteric liquid crystal waste from flexible displays pose a significant challenge for recycling, as existing methods are inefficient and lack effective solutions for recovering the valuable material.
Innovation Solution
A method involving the use of hydrophilic and hydrophobic solvents to separate and extract cholesteric liquid crystals from micro-encapsulated cholesteric liquid crystals, followed by solvent removal and purification using adsorbents, allowing for the recycling of cholesteric liquid crystals and modulation of their photoelectric properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If micro-encapsulated cholesteric liquid crystal is used in flexible displays, then display performance is improved, but material cost and environmental pollution increase
Solution Approach 1:
The patent implements a recycling process that recovers cholesteric liquid crystal from discarded flexible displays. The process involves extracting the liquid crystal from micro-encapsulated structures using solvent systems, purifying it through filtration and centrifugation, and restoring its functional properties for reuse in new display applications, thereby converting waste material into reusable resources
Solution Approach 2:
The patent employs extraction techniques using hydrophilic and hydrophobic solvent systems to separate and isolate cholesteric liquid crystal from the micro-encapsulated matrix and other display medium components. This extraction process enables the recovery of the valuable liquid crystal material while leaving behind waste encapsulation materials and dispersants
2Loss of substance
If existing recycling methods are used, then some recovery is achieved, but recycling efficiency is low
Solution Approach 1:
The patent optimizes recycling efficiency by systematically adjusting critical parameters including solvent composition ratios (hydrophilic to hydrophobic), temperature conditions during extraction, pH levels, and processing time. These parameter optimizations maximize the extraction efficiency of cholesteric liquid crystal while minimizing energy consumption and processing time, achieving high recovery rates with improved productivity
3Loss of substance
If cholesteric liquid crystal is extracted and purified, then recycling percentage is improved, but photoelectric properties may be degraded
Solution Approach 1:
The patent uses carefully selected solvent systems as intermediaries that selectively interact with the micro-encapsulated structure and dispersant components without damaging the cholesteric liquid crystal molecules. The solvent extraction process is designed to dissolve encapsulation materials and dispersants while leaving the liquid crystal intact, and purification steps use filtration and centrifugation methods that separate impurities without degrading the liquid crystal's photoelectric properties
Solution Approach 2:
The patent employs preliminary protective measures during the recycling process, including controlling extraction temperature within optimal ranges, using gentle mixing conditions, and implementing staged purification steps. These preliminary actions prevent thermal degradation, mechanical damage, or chemical alteration of the cholesteric liquid crystal, ensuring that high recycling percentages are achieved while maintaining excellent photoelectric 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
This method achieves a high recycling percentage of cholesteric liquid crystals with preserved photoelectric properties, enabling their reuse in displays and reducing material costs while addressing environmental concerns.
Implementation Method 1
The shell is dissolved by a hydrophilic solvent at a temperature of between 70° C. and 100° C.
Implementation Method 2
adding a hydrophobic solvent to mix with the hydrophilic solvent; forming a second mixture of the display medium material, the hydrophobic solvent and the hydrophilic solvent, wherein the second mixture has a hydrophobic layer and a hydrophilic layer
Implementation Method 3
purification using adsorbents
Data Source
AI summary
A method of recycling a cholesteric liquid crystal is provided. The method includes providing a display medium material containing a micro-encapsulated cholesteric liquid crystal. The display medium material is mixed with a hydrophilic solvent to form a mixture having a temperature of between 70° C. and 100° C. Then, a hydrophobic solvent is added to mix with the hydrophilic solvent. The display medium material, the hydrophobic solvent and the hydrophilic solvent are mixed to form a mixture having a hydrophobic layer and a hydrophilic layer. The hydrophobic layer and the hydrophilic layer of the mixture are separated, wherein the hydrophobic layer contains a cholesteric liquid crystal and the hydrophobic solvent. Then, the hydrophobic solvent is removed from the hydrophobic layer to obtain the cholesteric liquid crystal.