Low Temperature Curing Epoxy-Urethane Coatings
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Solution Overview
Problem
The existing methods for producing glycidyl carbamate-functional resins rely on glycidol, which is expensive and poses health hazards, limiting the development of thermosets with desirable properties for coatings and adhesives.
Innovation Solution
A two-step process involving the reaction of an isocyanate with allyl alcohol followed by epoxidation to form a glycidyl carbamate, eliminating the need for glycidol and allowing for the synthesis of epoxy-functional polyurethanes that cure at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glycidol is used to produce glycidyl carbamate-functional resins, then the desired thermoset properties are achieved, but the cost increases and health hazards arise
Solution Approach 1:
The patent replaces expensive glycidol with a two-step process using allyl alcohol (or vinyl group containing compounds) that are cheaper and safer alternatives. The allyl alcohol reacts with isocyanate to form allyl carbamate, which is then epoxidized to yield the desired glycidyl carbamate structure without requiring glycidol throughout the process.
Solution Approach 2:
The synthesis is divided into two separate steps: first the reaction of isocyanate with allyl alcohol to form allyl carbamate, and second the epoxidation of the allyl group to form the glycidyl carbamate. This segmentation allows the use of safer, cheaper starting materials while achieving the same final product properties.
2Reliability
If conventional epoxy-urethane systems are used, then good adhesion and barrier properties are provided, but the curing temperature is high and processing time is limited
Solution Approach 1:
The patent modifies the curing chemistry by using amine-curing agents that enable low-temperature curing (between ambient temperature and 0°C). This parameter change in curing conditions allows the epoxy-urethane system to maintain its adhesion and barrier properties while processing at much lower temperatures, extending pot life and improving workability.
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
This approach enables the production of epoxy-functional urethanes that cure between ambient temperature and 0°C, providing a cost-effective and safer alternative for producing coatings and adhesives with improved properties such as solvent resistance and flexibility.
Implementation Method 1
A two-step process involving the reaction of an isocyanate with allyl alcohol followed by epoxidation to form a glycidyl carbamate
Implementation Method 2
A two-step process involving the reaction of an isocyanate with allyl alcohol followed by epoxidation to form a glycidyl carbamate
Implementation Method 3
a curable coating composition comprising a reaction product of an epoxy-functional urethane compound and an amine-curing agent, wherein the curable coating composition cures between ambient temperature and 0 °C
Data Source
AI summary
Provided is a curable coating composition comprising a reaction product of an epoxyfunctional urethane compound and an amine-curing agent, wherein the curable coating composition cures between ambient temperature and 0 °C. Also provided is a process comprising applying the composition according to the previous sentence to a substrate and curing the composition. Coatings made from the curable composition may be applied to a variety of substrates.