Self-healing transparent coatings with conductive mineral colloids
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Solution Overview
Problem
Current self-healing coatings for optical lenses, such as those using Veriflex® polymers, suffer from excessive initial haze and poor scratch resistance, and existing thiol-ene resins exhibit limited healing performance for deeper scratches.
Innovation Solution
Incorporating conductive mineral colloids like Sb2O5 or SnO2 into thiol-ene resins, which are cured with polyfunctional thiols and allyl monomers, creates a transparent self-healing coating with improved healing performance and reduced haze values, while maintaining scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Veriflex® polymers are used as self-healing coatings, then self-healing performance is improved, but initial haze and scratch resistance deteriorate
Solution Approach 1:
The patent uses composite materials by combining thiol-ene resin with conductive mineral colloids (such as antimony oxide or tin oxide). This composite approach allows the coating to achieve both self-healing performance and improved optical clarity with maintained scratch resistance, resolving the contradiction between self-healing capability and initial haze/scratch resistance properties.
Solution Approach 2:
The patent changes the chemical composition parameters of the coating by incorporating specific conductive mineral colloids with controlled particle sizes and concentrations. This parameter modification enables the coating to simultaneously exhibit low initial haze, good scratch resistance, and effective self-healing performance, addressing the limitations of Veriflex® polymers.
2Reliability
If non-conductive colloids such as silica are incorporated into thiol-ene resins, then healing performance is improved, but scratch resistance decreases and haze value increases
Solution Approach 1:
The patent changes the key parameter of colloid conductivity by selecting conductive mineral colloids (antimony oxide, tin oxide) instead of non-conductive ones like silica. This parameter change fundamentally alters the coating's properties, enabling simultaneous improvement in scratch resistance and reduction in haze value while maintaining enhanced healing performance.
Solution Approach 2:
The patent creates a novel composite material system combining thiol-ene resin with conductive mineral colloids. This specific composite formulation achieves a balanced performance profile where the conductive nature of the colloids prevents the haze and scratch resistance issues observed with non-conductive colloids, while still providing improved self-healing capability.
3Object-affected harmful factors
If thiol-ene resins are used as protective coatings, then transparency is improved, but self-healing performance for deeper scratches deteriorates
Solution Approach 1:
The patent enhances thiol-ene resin by creating a composite with conductive mineral colloids. This composite structure provides the mechanical reinforcement needed for deeper scratch healing while preserving the inherent transparency of the thiol-ene resin system, resolving the contradiction between transparency and deep scratch self-healing performance.
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 resulting coatings demonstrate enhanced self-healing capabilities and lower haze values, effectively addressing the limitations of previous coatings by achieving significant healing levels and maintaining scratch resistance.
Implementation Method 1
from 0.5 to 7 % by weight of conductive mineral colloids homogeneously dispersed therein
Implementation Method 2
a polythiol-ene matrix obtained by curing a liquid monomer mixture comprising at least one polyfunctional thiol and at least one polyfunctional allyl monomer
Implementation Method 3
display interesting transparency and a shape memory effect with transition temperature in the range of 45 to 65 °C
Data Source
AI summary
An optical article comprising (a) a transparent optical substrate and (b) a transparent coating, said transparent coating being the outermost coating of the optical article and consisting essentially of - a polythiol - ene matrix obtained by curing a liquid monomer mixture comprising at least one polyfunctional thiol and at least one polyfunctional allyl monomer, said cured polythiol - ene matrix having a glass transition temperature comprised in the range of from 40 °C to 70 °C, and - from 0.5 to 7 % by weight of conductive mineral colloids homogeneously dispersed therein. It is also drawn to a method for preparing such an optical article and to a method for repairing scratches on such an optical article by heating.