Episulfide Polymerization Temperature Profiling for Optical Quality
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Solution Overview
Problem
Existing methods for manufacturing optical materials using episulfide compounds fail to control polymerization temperature conditions effectively, leading to optical distortion and striae due to variations in polymerization rates, especially in large lenses.
Innovation Solution
A method for setting polymerization conditions by calculating polymerization temperatures based on reaction rate coefficients and functional group ratios to maintain controlled polymerization rates and minimize standard deviations, using episulfide compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional polymerization methods are used for episulfide compounds, then manufacturing process is simple, but polymerization rate varies causing optical distortion and striae
Solution Approach 1:
The patent applies dynamics by making the polymerization temperature time-dependent rather than constant. The temperature is dynamically adjusted in multiple stages: initially raised to accelerate polymerization, then reduced to control the rate and minimize variations. This dynamic temperature control resolves the contradiction by enabling precise optical quality without requiring overly complex control systems.
Solution Approach 2:
The patent changes the temperature parameter during the polymerization process. Specifically, the temperature is first increased to a higher level to initiate and accelerate polymerization, then reduced to a lower level to control the polymerization rate and minimize variations that cause optical defects. This parameter change strategy achieves high manufacturing precision while keeping the control system manageable.
2Productivity
If polymerization temperature is increased to accelerate reaction, then productivity improves, but polymerization rate variation increases causing optical defects
Solution Approach 1:
The patent applies periodic action by using staged temperature control with distinct phases. The temperature is first raised to accelerate polymerization (increasing productivity), then reduced to control the rate and minimize variations (maintaining optical quality). This periodic adjustment of temperature resolves the contradiction between productivity and manufacturing precision.
Solution Approach 2:
The patent uses dynamic temperature adjustment where the temperature profile changes over time rather than remaining constant. The initial temperature increase boosts polymerization speed for productivity, while the subsequent reduction controls the rate to prevent optical defects. This dynamic approach balances productivity and optical quality.
3Manufacturing precision
If constant temperature polymerization is used, then control system is simple, but optical distortion and striae occur due to polymerization rate variations
Solution Approach 1:
The patent resolves this contradiction by implementing a moderately complex dynamic temperature control system that adjusts temperature in stages. The system first raises temperature to initiate polymerization, then reduces it to control the rate. This dynamic control achieves high optical quality while keeping the control system complexity at an acceptable level.
Solution Approach 2:
The patent changes the temperature parameter during polymerization to achieve high optical quality. The temperature is adjusted in stages rather than kept constant, which resolves the optical defects while maintaining manageable control system complexity through systematic parameter changes.
4Productivity
If polymerization is accelerated to reduce manufacturing time, then productivity improves, but optical distortion and striae increase
Solution Approach 1:
The patent applies periodic action through staged temperature control. The temperature is first increased to accelerate polymerization and reduce manufacturing time (improving productivity), then reduced to control the polymerization rate and minimize optical defects (maintaining quality). This periodic temperature adjustment resolves the contradiction between productivity and optical quality.
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 approach suppresses optical distortion and striae, resulting in high-quality optical materials with excellent appearance, particularly in large lenses.
Implementation Method 1
a polymerization catalyst; a cured resin obtained by heating and polymerizing a composition which includes a polymerizable reactive compound including an episulfide compound, and a polymerization catalyst
Implementation Method 2
a cured resin obtained by heating and polymerizing a composition
Data Source
AI summary
The method for setting polymerization conditions includes a physical property acquiring step, in which, when a composition which includes a polymerizable reactive compound including an episulfide compound, and a polymerization catalyst is heated and maintained at a predetermined temperature, a physical property value a derived from a functional group of the polymerizable reactive compound before heating and a physical property value b derived from a remaining functional group after maintaining heat for a predetermined time, are acquired; a remaining functional group ratio calculating step of calculating a remaining functional group ratio; a reaction rate coefficient calculating step for calculating a reaction rate coefficient; and a polymerization temperature calculating step of back-calculating each polymerization temperature every predetermined time in a polymerization time.