Self-repairing Polyurethane Resin with Chemical Resistance
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Solution Overview
Problem
Conventional self-repairing polyurethane resin coatings lack sufficient chemical resistance properties, which is a limitation in applications requiring both self-repairing and chemical resistance.
Innovation Solution
A self-repairing polyurethane resin material is developed by reacting pentamethylenediisocyanate with an active hydrogen group-containing compound, specifically a polyol compound with a number average molecular weight of 100 to 2000 and an average functionality of 2 to 3, incorporating bifunctional and trifunctional polyols, and containing isocyanate groups, allophanate groups, and isocyanate trimers to enhance chemical resistance and self-repairing capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a coating is formed by hard coating treatment to increase crosslink density, then abrasion resistance is improved, but brittleness increases and self-repairing properties deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the polyol compound, specifically using a polyol with number average molecular weight of 100 to 2000 and average functionality of 2 to 3, containing carbonate and/or ester groups. This parameter optimization enables the coating to achieve both high crosslink density for abrasion resistance and sufficient flexibility for self-repairing properties.
Solution Approach 2:
The patent creates a composite polyurethane resin system by reacting pentamethylenediisocyanate with specific polyol compounds containing carbonate and/or ester groups. This composite material structure combines the hardness and chemical resistance from the isocyanate-polyol reaction with the self-repairing capabilities inherent in the optimized polyol structure.
2Reliability
If self-repairing polyurethane resin coating is formed, then self-repairing properties are improved, but chemical resistance deteriorates
Solution Approach 1:
The patent optimizes the molecular weight (100 to 2000) and functionality (2 to 3) parameters of the polyol compound, and specifies the inclusion of carbonate and/or ester groups. These parameter changes create a molecular structure that simultaneously provides self-repairing capability through chain mobility and chemical resistance through dense crosslinking.
Solution Approach 2:
The patent introduces local structural variations by incorporating specific functional groups (carbonate and/or ester groups) at specific positions within the polyol molecule. This local quality enhancement allows different regions of the coating to exhibit different properties: self-repairing capability in the polymer chains and chemical resistance in the crosslinked network.
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 self-repairing polyurethane resin exhibits excellent self-repairing and chemical resistance properties, with characteristics such as high gloss retention and low compression set, making it suitable for various industrial applications.
Implementation Method 1
the self-repairing polyurethane resin material is produced by reaction of pentamethylenediisocyanate and an active hydrogen group-containing compound
Implementation Method 2
the polyol compound contains a carbonate group and/or an ester group, and the polyol compound contains a bifunctional polyol compound and a trifunctional polyol compound
Data Source
AI summary
In a self-repairing polyurethane resin material produced by reaction of pentamethylenediisocyanate with an active hydrogen group-containing compound, the active hydrogen group-containing compound contains a polyol compound having a number average molecular weight of 100 to 2000 and an average functionality of 2 to 3.