Polythiol Synthesis for Optical Resin Strength
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Solution Overview
Problem
Polythiourethane resins used in optical components, such as spectacle lenses, face challenges in achieving high tensile strength without compromising heat resistance, as improving tensile strength often leads to decreased heat resistance during processing and heat treatment.
Innovation Solution
A method involving the reaction of 2-mercaptoethanol with epihalohydrin in the presence of a halide, specifically 2,3-dihalogeno-1-propanol or allyl halide, within a specific concentration range, to produce a polythiol compound that enhances the tensile strength of polythiourethane resins without significantly reducing heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tensile strength of polythiourethane resin is improved by adjusting the polythiol compound structure, then the resin can withstand processing forces better, but heat resistance decreases making heat treatment difficult
Solution Approach 1:
The invention changes the chemical composition parameters of the polythiol compound by introducing specific structural features (cyclic structures, specific molecular weights, and compositional ratios of different polythiol components) to achieve both high tensile strength and heat resistance simultaneously. By controlling the composition within specific ranges (e.g., 20-80 mass% of one polythiol component and 20-80 mass% of another), the resin achieves optimal balance between mechanical strength and thermal stability for heat treatment processing.
2Reliability
If a polythiourethane resin with high tensile strength is used, then occurrence of fissures and cracks during processing can be prevented, but heat resistance may be compromised
Solution Approach 1:
The invention creates a composite polythiourethane resin system by combining multiple polythiol compounds with specific structural characteristics. The resin comprises copolymerized structures formed from different polythiol monomers, creating a composite material that integrates the advantages of each component: high molecular weight polythiols provide strength and crack resistance, while cyclic structures contribute to heat resistance, achieving both reliability during processing and thermal stability.
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 effectively improves the tensile strength of polythiourethane resins while maintaining or minimizing the decrease in heat resistance, making them suitable for optical components that require both properties.
Implementation Method 1
reacting 2-mercaptoethanol with an epihalohydrin, wherein the reaction is carried out in the presence of a halide selected from the group consisting of a 2,3-dihalogeno-1-propanol and an allyl halide
Implementation Method 2
a curing reaction of a polythiol compound and a polyiso(thio)cyanate compound
Data Source
AI summary
Provided is a method for producing a polythiol compound, including reacting 2-mercaptoethanol with an epihalohydrin, wherein the reaction is carried out in the presence of a halide selected from the group consisting of a 2,3-dihalogeno-1-propanol and an allyl halide, and an amount of the halide in the reaction is more than 0.50% by mass and 10.00% by mass or less with respect to the total amount of the halide and the epihalohydrin. Also provided are a method for producing a curable composition, including producing a polythiol compound by the abovementioned production method, and a method for producing a cured product, including producing a curable composition by the abovementioned production method.