Polyamide Polarized Lens with Polysiloxane Lacquer for Scratch Resistance
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Solution Overview
Problem
Conventional polarized lenses face limitations in mechanical characteristics, surface hardness, scratch resistance, chemical resistance, residual stresses, and suitability for frameless mounts, with complex and lengthy production processes that can affect final quality.
Innovation Solution
A polarized lens comprising a polyamide resin with a polarizing wafer and external lacquering layers, using adhesion promoters and surface treatments to enhance mechanical properties and simplify production, allowing for frameless mounting and improved chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional lacquering processes are used on polycarbonate lenses, then the production process is simple and well-established, but surface hardness and scratch resistance are insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and cross-linking density of the lacquering layers. The use of specific resin systems (epoxy, polyester, acrylic) with controlled molecular weights and functional groups, along with precise curing parameter optimization, achieves enhanced surface hardness and scratch resistance while maintaining manufacturing feasibility through established coating methodologies.
Solution Approach 2:
The patent employs composite materials by creating multi-layer lacquering systems where different resin types (epoxy, polyester, acrylic) are combined with adhesion promoters, fillers, and cross-linking agents. This composite approach provides synergistic effects that improve surface hardness, scratch resistance, and chemical resistance beyond what single materials can achieve.
2Reliability
If conventional lacquering processes are used on polycarbonate lenses, then the production process is simple and well-established, but chemical resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition and cross-linking density of the lacquering layers. The use of specific resin systems (epoxy, polyester, acrylic) with controlled molecular weights and functional groups, along with precise curing parameter optimization, achieves enhanced surface hardness and scratch resistance while maintaining manufacturing feasibility through established coating methodologies.
Solution Approach 2:
The patent employs composite materials by creating multi-layer lacquering systems where different resin types (epoxy, polyester, acrylic) are combined with adhesion promoters, fillers, and cross-linking agents. This composite approach provides synergistic effects that improve surface hardness, scratch resistance, and chemical resistance beyond what single materials can achieve.
3Reliability
If lengthy thermal curing is applied during production, then the lacquering process is thorough and durable, but residual stresses increase and final quality decreases
Solution Approach 1:
The patent applies periodic action by implementing multi-stage curing processes with alternating temperature profiles and intermediate processing steps. The method uses sequential curing cycles at different temperatures with controlled durations, allowing stress relaxation between stages while achieving complete polymerization, thereby reducing residual stresses and improving optical quality.
Solution Approach 2:
The patent applies parameter changes by modifying the chemical composition and cross-linking density of the lacquering layers. The use of specific resin systems (epoxy, polyester, acrylic) with controlled molecular weights and functional groups, along with precise curing parameter optimization, achieves enhanced surface hardness and scratch resistance while maintaining manufacturing feasibility through established coating methodologies.
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 polarized lens achieves higher surface hardness, better scratch resistance, reduced residual stresses, and improved chemical resistance, with faster and more economical production, making it suitable for frameless mounts and maintaining optical transparency.
Implementation Method 1
lenses that are capable of filtering the component of light that has a certain polarization (for example horizontal light, i.e. the component of electromagnetic radiation that oscillates along horizontal planes)
Implementation Method 2
using adhesion promoters and surface treatments to enhance mechanical properties
Data Source
AI summary
A polarized lens for eyeglasses and the like, which includes a polarizing wafer superimposed on a lens body made of polyamide material and at least one external layer of lacquering which coats externally the polarizing wafer and the lens body,The polarizing waferincludes an internal polarizing layer between a first external layer of polyamide and a second external layer of polyamide,a first layer of glue interposed between the internal polarizing layer and the first external layer of polyamide, anda second layer of glue interposed between the internal polarizing layer and the second external layer of polyamide, The at least one external layer of lacquering includes at least one polysiloxane or acrylic lacquer.