Polyurea Waterproof Coating With Fast Low-Temperature Curing
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Solution Overview
Problem
Existing coating systems for concrete and steel substrates are not VOC-free, require high temperatures for curing, generate plastic waste, and lack fast curing and excellent mechanical properties.
Innovation Solution
A two-component coating system comprising components (A) and (B) with aromatic moieties and isocyanate groups, auto-catalytic curing, and a solid content of at least 95 wt.%, allowing sprayable, VOC-free application and fast curing at low temperatures with excellent mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional coating systems are used, then application is possible, but VOC content is high and environmental compatibility is poor
Solution Approach 1:
The patent changes the chemical composition parameters by using aromatic moieties with isocyanate groups and carbodiimide/uretonimine units, achieving VOC-free formulation while maintaining fast auto-catalytic curing through molecular structure optimization rather than solvent addition
Solution Approach 2:
The invention extracts and eliminates organic solvents from the coating system entirely, using a solvent-free formulation where components (A) and (B) are mixed in controlled ratios to achieve both environmental compatibility and rapid curing without VOC emissions
2Productivity
If high temperatures are used for curing, then curing speed is improved, but energy consumption increases and application flexibility is reduced
Solution Approach 1:
The coating system utilizes self-service auto-catalytic curing where the aromatic moieties and carbodiimide/uretonimine units in component (B) automatically catalyze the reaction upon mixing with component (A), enabling fast curing at low temperatures without external heating energy input
Solution Approach 2:
The invention changes the chemical reactivity parameters by incorporating specific aromatic structures with isocyanate groups that inherently provide fast reaction kinetics at ambient temperatures, eliminating the need for thermal energy input while maintaining high productivity
3Object-affected harmful factors
If solvent-free composition is used, then VOC content is reduced, but application viscosity and sprayability are affected
Solution Approach 1:
The patent optimizes the molecular weight and functional group parameters of components (A) and (B) to achieve an ideal balance between viscosity and reactivity, ensuring sprayable consistency without solvents while maintaining fast auto-catalytic curing through precise compositional control
4Productivity
If fast curing is achieved, then productivity is improved, but mechanical properties and adhesion may be compromised
Solution Approach 1:
The invention creates a composite chemical structure where aromatic moieties, isocyanate groups, and carbodiimide/uretonimine units work synergistically to provide both rapid auto-catalytic curing and excellent mechanical properties including adhesion to concrete and steel substrates, chemical resistance, and abrasion resistance
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 coating system provides a waterproof barrier with improved chemical resistance, abrasion resistance, and adhesion to substrates at low temperatures, reducing curing time and plastic waste generation.
Implementation Method 1
component (A) comprises at least one constituent (a1) containing at least one aromatic moiety and bearing on average at least two primary and/or secondary amino groups, wherein component (B) comprises at least one constituent (b1) containing at least one aromatic moiety and bearing on average at least two isocyanate groups
Data Source
AI summary
The present invention relates to a 2K coating system consisting of two components (A) and (B) being separate from each other, wherein (A) comprises at least one constituent (a1) containing at least one aromatic moiety and bearing on average at least two primary and/or secondary amino groups, wherein (B) comprises at least one constituent (b1) containing at least one aromatic moiety and bearing on average at least two isocyanate groups, wherein each of (A) and (B) has a solid content of at least 95 wt.-%, based on the total weight of the respective component, the amount of any fillers present in component (A) does not exceed 45 wt.-%, based on the total weight of component (A), and constituent (b1) present in component (B) bears carbodiimide and/or uretonimine units as well as at least one structural unit (I), a coating composition obtainable by mixing components (A) and (B) of the inventive coating system, a use of said coating composition as sealant, in particular for providing a waterproof coating on a substrate, a method of applying the coating composition to a substrate and in particular a method of sealing a surface of a substrate such as concrete and/or steel, and a coated substrate such as a sealed concrete and/or steel substrate obtainable by this method.