Polyurethane Coating with Reactive Compound for Bubble-Free Curing
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Solution Overview
Problem
Conventional two-component polyurethane compositions based on aromatic isocyanates have limitations in open time, strength, and elasticity, often forming bubbles under unfavorable conditions and requiring the use of toxic or discoloring additives to enhance processing time and strength.
Innovation Solution
A composition comprising a polyol and a compound with a reactive group of formula (I), which increases strength and toughness without shortening open time or extensibility, and does not release outgassing or plasticizing compounds, thereby avoiding odor emissions and migration issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If aromatic isocyanates are used as the isocyanate component, then cost is reduced, but the composition forms bubbles under unfavorable climatic conditions and has limited strength
Solution Approach 1:
The patent changes the chemical parameters by introducing a specific compound with formula (I) containing reactive groups that modify the curing mechanism. This compound enables the use of aromatic isocyanates without bubble formation by altering the reaction kinetics and compatibility parameters between the polyol and isocyanate components, resolving the contradiction between cost reduction and reliability.
2Strength
If polyamines are added to the polyol component to suppress bubble formation and increase strength, then strength is improved, but extensibility and elasticity are reduced
Solution Approach 1:
The patent introduces a compound with formula (I) as an intermediary substance that mediates between the polyol and aromatic isocyanate components. This intermediary enables bubble suppression and strength enhancement without the need for polyamines, thereby maintaining the extensibility and elasticity that would otherwise be reduced by polyamine addition.
3Loss of time
If sterically hindered and electronically deactivated aromatic polyamines are used to extend processing time, then processing time is increased, but the polyamines are solid at room temperature, toxic, and cause discoloration
Solution Approach 1:
The patent replaces toxic, solid aromatic polyamines with a compound of formula (I) that is liquid at room temperature, non-toxic, and does not cause discoloration. This substitution achieves sufficient processing time extension without the harmful properties of conventional aromatic polyamines, effectively using a superior alternative that eliminates the need for toxic additives.
4Loss of time
If latent curing agents are used instead of polyamines, then processing time is extended, but the blocking agent released leads to unwanted odor formation, emission, migration or plasticizing action
Solution Approach 1:
The patent extracts and eliminates the harmful blocking agents that cause odor formation and emission in latent curing agents. By using a compound with formula (I) that does not require blocking agents to extend processing time, the invention removes the source of unwanted odor, emission, migration, and plasticizing effects while maintaining extended processing time benefits.
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 composition provides a long open time, high strength, and high elasticity with minimal emissions, making it suitable for durable coatings that are resistant to mechanical stress and suitable for applications like floor coatings and roof sealing, with improved crack bridging properties.
Implementation Method 1
They consist of a polyol component and an isocyanate component that are stored separately from one another. For application, the two components are mixed with one another, as a result of which the composition cures to give a polymeric elastic material.
Data Source
AI summary
A composition including a first component containing at least one polyol and at least one compound having at least one reactive group of the formula (I), and a second component containing at least one aromatic polyisocyanate and/or at least one polymer containing aromatic isocyanate groups. The composition has a long open time and, even in the case of small amounts of compound having at least one reactive group of the formula (I), enables elastic coatings having improved mechanical properties without causing problems with odor emissions or migration effects. It is thus particularly suitable as a coating for floors or roof areas.