Self-restoring Polyurethane Coating via Disulfide Exchange
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Solution Overview
Problem
Existing self-restoring polyurethane-based coatings require external heat or light treatment to restore scratches, which is inconvenient and limits their practical application.
Innovation Solution
A self-restoring polyurethane-based polymer is developed using a composition containing an aromatic disulfide diol and an alicyclic polyisocyanate, allowing for self-restoration at room temperature without additional heat treatment or light irradiation, with a self-restoring rate of 50% or more and maintaining high toughness after re-conjugation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intrinsic-type self-restoring materials are used, then re-restoration capability is improved, but external heat treatment or light treatment is required which reduces ease of operation
Solution Approach 1:
The coating film incorporates disulfide bonds that automatically undergo exchange reactions at room temperature when scratches occur, enabling the material to self-repair without requiring external heat treatment, light irradiation, or other external stimuli. The system serves itself by utilizing the inherent chemical reactivity of disulfide groups to restore the coating structure.
Solution Approach 2:
The patent changes the chemical parameter of the coating material by incorporating disulfide bonds (—S—S—) into the polymer structure. This chemical modification enables room-temperature self-restoration by allowing disulfide exchange reactions to occur spontaneously, eliminating the need for external energy input while maintaining re-restoration capability.
2Ease of operation
If extrinsic-type self-restoring mechanism is used, then ease of operation is improved, but re-restoration capability deteriorates due to microcapsule exhaustion
Solution Approach 1:
The coating film incorporates disulfide bonds that automatically undergo exchange reactions at room temperature when scratches occur, enabling the material to self-repair without requiring external heat treatment, light irradiation, or other external stimuli. The system serves itself by utilizing the inherent chemical reactivity of disulfide groups to restore the coating structure.
Solution Approach 2:
The patent changes the chemical parameter of the coating material by incorporating disulfide bonds (—S—S—) into the polymer structure. This chemical modification enables room-temperature self-restoration by allowing disulfide exchange reactions to occur spontaneously, eliminating the need for external energy input while maintaining re-restoration capability.
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 polymer achieves self-restoration at room temperature with a high self-restoring rate and toughness restoring rate, ensuring excellent solvent resistance and transparency, overcoming the limitations of external stimulus-dependent restoration.
Implementation Method 1
a self-restoring polyurethane-based polymer obtained by polymerization of a composition containing an aromatic disulfide diol... an alicyclic polyisocyanate... and a polyol
Implementation Method 2
self-restoring at room temperature without additional heat treatment or light-irradiation... by using an aromatic disulfide diol... as a monomer component
Data Source
AI summary
A self-restoring polyurethane-based polymer obtained by polymerization of a composition containing an aromatic disulfide diol represented by Chemical Formula, HO—Ar1—S—S—Ar2—OH, an alicyclic polyisocyanate, and a polyol. Ar1 and Ar2 each are independently a substituted or unsubstituted C6-C30 arylene group. The composition satisfies Equation, 0.1≤M[disulfide]/M[OH]. M[disulfide] is a total mole number of the aromatic disulfide diol in the composition, and M[OH] is a total mole number of the aromatic disulfide diol and the polyol in the composition.