Solvent-Free Polyurea Coatings via Cyclic Carbonate Viscosity Control
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Solution Overview
Problem
Current polyurea coatings contain high levels of solvents, which are environmentally harmful and pose health risks, and reducing solvent content often compromises their durability and increases costs, as seen in the use of lower viscosity materials like hexamethylene diisocyanate (HDI) isocyanate trimers.
Innovation Solution
A two-component composition for forming polyureas with less than 1 weight % solvent, comprising an isocyanate, a resin with difunctional or multifunctional hindered amines, and a cyclic alkylene carbonate, where the cyclic alkylene carbonate is used to reduce viscosity and participate in the reaction, optionally including a polyol to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional high viscosity components are used to form polyurea coatings, then the physical properties and durability are maintained, but the solvent content must be increased to achieve usable consistency
Solution Approach 1:
The invention changes the viscosity parameter of the isocyanate component by using a novel low viscosity cyclic carbonate compound instead of traditional high viscosity isocyanates. This parameter change allows the formulation to achieve usable consistency with minimal or no solvent while maintaining the reactive properties needed for durable polyurea coatings.
Solution Approach 2:
The invention uses a cyclic carbonate compound that replicates the essential functions of traditional high viscosity isocyanates (reactivity, coating formation) but with fundamentally different physical properties (low viscosity). This allows the system to copy the desired chemical behavior while eliminating the harmful high viscosity that necessitates solvent addition.
2Object-affected harmful factors
If lower viscosity raw materials are used to reduce solvent content, then the environmental impact is reduced, but the physical properties and durability of polyureas deteriorate
Solution Approach 1:
The invention changes the molecular structure parameter of the isocyanate component by introducing a cyclic carbonate structure. This structural parameter change simultaneously achieves low viscosity (reducing solvent need) and maintains or enhances reactivity and film-forming properties (maintaining durability), thus resolving the trade-off between environmental friendliness and performance.
3Object-affected harmful factors
If lower viscosity components are used to reduce solvent content, then the environmental impact is reduced, but the cost increases significantly
Solution Approach 1:
The invention uses a cyclic carbonate compound that copies the essential isocyanate functions (reactivity with amines, coating formation) but with superior physical properties (low viscosity). This alternative copying approach eliminates the need for expensive low viscosity isocyanate trimers while achieving the same solvent-reduction goal, thus resolving the cost issue.
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 solvent-free composition maintains or improves the physical properties of polyureas, reduces environmental impact, and lowers costs by using cyclic alkylene carbonates instead of traditional solvents, while ensuring effective curing and durability.
Implementation Method 1
a cyclic alkylene carbonate; wherein the composition comprises less than 1 weight % solvent
Implementation Method 2
Polyurea coatings are typically formed by mixing together a resin component and an isocyanate (hardener) component. The two components react together readily
Data Source
AI summary
The present invention relates to compositions for forming polyureas. The present invention also relates to methods of forming polyureas. The present invention also relates to kits for forming polyureas.