Bio-Based Polycarbonate Ester Resin for Heat-Resistant Eyeglass Frames
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Solution Overview
Problem
Existing plastic materials for eyeglass frames, such as Grilamid TR90, Ultem 1000, and Rilsan G850/Treva, lack sufficient heat resistance, impact strength, colorability, and processing ease, making them unsuitable for high-quality, body-friendly eyeglass frames.
Innovation Solution
A bio-based polycarbonate ester resin comprising repeat units derived from 1,4:3,6-dianhydrohexitol, 1,4-cyclohexanedicarboxylate, and terephthalate, with controlled cis/trans ratios and melt polycondensation under reduced pressure, achieving high heat resistance, transparency, and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If petroleum-based materials such as Grilamid TR90 and Ultem 1000 are used for eyeglass frames, then mechanical properties and elasticity are improved, but heat resistance and environmental friendliness deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating bio-based monomers (1,4:3,6-dianhydrohexitol, isosorbide, isoidide) with specific glass transition temperature ranges (80-150°C) to achieve both good mechanical properties and heat resistance. The controlled ratio of repeat units (Formulae 1-3) creates a polymer structure that balances elasticity and thermal stability.
Solution Approach 2:
The invention creates a composite polymer structure combining multiple repeat units: carbonate esters (Formula 1), cyclohexanedicarboxylate esters (Formula 2), and terephthalate esters (Formula 3). This composite molecular structure integrates the advantages of different polymer segments to achieve superior mechanical properties and heat resistance simultaneously.
2Object-affected harmful factors
If bioplastic materials such as Rilsan G850 and Treva are used, then body-friendliness and bio-based carbon content are improved, but heat resistance and processing temperature deteriorate
Solution Approach 1:
The patent adjusts the glass transition temperature parameter to 80-150°C, which is higher than conventional bioplastics (120°C maximum), thereby improving heat resistance while maintaining body-friendliness. The specific combination of bio-based monomers with controlled molecular structure achieves this parameter optimization.
3Weight of moving object
If Grilamid TR90 is used for eyeglass frames, then lightweight and elasticity are improved, but post-processing and painting capability deteriorate
Solution Approach 1:
The patent modifies the surface energy and chemical composition parameters of the polymer to improve paintability and coating characteristics. The specific repeat unit structure provides better adhesion for post-processing treatments while maintaining the lightweight property.
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 bio-based polycarbonate ester resin offers excellent heat resistance, transparency, strength, and chemical resistance, allowing for various color applications and reduced production costs due to low processing temperatures, while being environmentally friendly.
Implementation Method 1
A bio-based polycarbonate ester resin prepared by melt polycondensation of 1,4:3,6-dianhydrohexitol with a carbonate, 1,4-cyclohexanedicarboxylate, or a terephthalate
Implementation Method 2
melt polycondensation under reduced pressure
Data Source
AI summary
The present invention relates to a bio-based polycarbonate ester resin for an eyeglass frame, the resin being environment friendly by not containing types of bisphenol, and exhibiting excellent heat resistance, transparency, strength, hardness, dimensional stability and chemical resistance. In addition, various colors may be painted and coated on during post-processing, a separate additive is not required during a molding process, and processing is undergone at a temperature lower than that for conventional plastic materials for an eyeglass frame, and thus manufacturing costs may be reduced.