Polymerization Temperature Setting via Reaction Rates for Optical Materials
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Solution Overview
Problem
The polymerization rate of polymerizable compositions in plastic lenses varies due to temperature distribution, leading to optical distortion and striae during curing, which existing methods fail to address effectively.
Innovation Solution
Setting polymerization temperature conditions by analyzing functional group ratios and reaction rates to control polymerization within specific ranges, thereby suppressing optical distortion and striae.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If polymerization is performed at elevated temperature to increase polymerization rate, then productivity is improved, but optical distortion and striae are generated due to increased temperature distribution
Solution Approach 1:
The patent applies parameter changes by systematically varying temperature conditions during polymerization. Specifically, it uses a two-stage temperature control method: initial heating to 60-80°C to activate polymerization, then cooling to 20-40°C to control the reaction rate and minimize temperature distribution. This dynamic parameter adjustment resolves the contradiction between maintaining high polymerization rate and preventing optical defects.
Solution Approach 2:
The patent implements periodic action through staged temperature control during the polymerization process. The process alternates between heating phases (to initiate and sustain polymerization) and cooling phases (to control reaction rate and reduce temperature gradients). This periodic temperature management allows the system to achieve both high productivity and optical quality by cycling between conditions that favor each objective.
2Manufacturing precision
If temperature is maintained uniformly to suppress optical distortion, then manufacturing precision is improved, but polymerization rate decreases due to reduced temperature
Solution Approach 1:
The patent applies preliminary action by pre-heating the polymerizable composition to 60-80°C before initiating polymerization. This initial temperature elevation ensures rapid polymerization onset and high reaction rate. Subsequently, the temperature is reduced to 20-40°C to maintain uniform conditions and prevent optical defects. The preliminary heating action thus secures both high productivity and optical quality.
Solution Approach 2:
The patent implements dynamics through time-dependent temperature control. The temperature is dynamically adjusted during the polymerization process: initially elevated to 60-80°C to maximize polymerization rate, then progressively reduced to 20-40°C to maintain uniformity and prevent defects. This dynamic temperature management allows the system to adapt to different stages of polymerization, achieving both high productivity and optical precision.
3Manufacturing precision
If cooling is applied to control polymerization rate and reduce temperature distribution, then optical quality is improved, but polymerization time increases
Solution Approach 1:
The patent applies continuity of useful action by maintaining the polymerization reaction continuously active through controlled cooling rather than stopping or significantly reducing the reaction rate. The temperature is reduced to 20-40°C to control the reaction and prevent defects, but the polymerization continues uninterrupted to completion. This continuous operation minimizes total processing time while achieving optical quality through controlled rate management.
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 ensures consistent polymerization rates and reduces optical distortion and striae, resulting in high-quality optical materials with excellent appearance.
Implementation Method 1
heating a composition including a polymerization-reactive compound and a polymerization catalyst and/or a polymerization initiator
Implementation Method 2
a spectral intensity in IR measurement
Implementation Method 3
a 1H-NMR spectral intensity, or a 13C-NMR spectral intensity
Data Source
AI summary
A method for setting polymerization condition includes a physical property acquiring step of, when heating a composition including a polymerization-reactive compound and a polymerization catalyst and/or a polymerization initiator and retaining heat at a predetermined temperature, acquiring a physical property value a derived from a functional group before heating of the polymerization-reactive compound and a physical property value b derived from a remaining functional group after maintaining a temperature for a predetermined time; a remaining functional group ratio calculating step of calculating a remaining functional group ratio from the physical property value a and the physical property value b; a reaction rate coefficient calculating step of calculating a reaction rate coefficient from the remaining functional group ratio on the basis of a reaction rate equation; and a polymerization temperature calculating step of calculating a polymerization temperature on the basis of the reaction rate coefficient and conditions below.