TAED Encapsulation via Interfacial Polymerization for Hydrolytic Stability
Solution Overview
Problem
Tetraacetylethylenediamine (TAED) loses effectiveness in liquid detergent formulations due to hydrolysis, forming N,N'-diacetylethylenediamine, which is not effective as a detergent active, making it unsuitable for aqueous systems without modification.
Innovation Solution
An additive comprising TAED or triacetylethylenediamine encapsulated through an interfacial polymerization reaction with a (poly)isocyanate and a polyamine, forming a stable copolymer network that maintains the active's effectiveness in aqueous environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TAED is used in liquid detergent formulations, then it provides detergent activity, but it undergoes hydrolysis and loses effectiveness
Solution Approach 1:
The additive is segmented into an internal phase containing TAED or TriAED and an external polymer shell formed by interfacial polymerization of (poly)isocyanate and polyamine. This segmentation isolates the active from water while maintaining its detergent function, resolving the contradiction between activity and stability.
Solution Approach 2:
The polymer shell acts as an intermediary barrier between the active (TAED/TriAED) and water. This intermediary layer prevents direct contact between water and the active, eliminating hydrolysis while preserving detergent activity during storage and use.
2Stability of the object's composition
If TAED is encapsulated to prevent hydrolysis, then hydrolytic stability is improved, but the active may be released prematurely or not at all
Solution Approach 1:
The polymer shell parameters (composition, thickness, crosslinking density) are optimized to balance stability and release. The shell is designed with specific properties that prevent hydrolysis during storage but allow controlled release under washing conditions, resolving the contradiction between stability and ease of operation.
Solution Approach 2:
The encapsulation system transitions from a stable, protected state during storage to a dynamic release state during washing. The polymer shell maintains integrity under storage conditions but becomes permeable or degrades controllably under washing conditions (temperature, agitation, water contact), enabling timely release of the active.
3Stability of the object's composition
If an emulsion is used to encapsulate the active, then it provides stability in aqueous formulation, but the formulation complexity increases
Solution Approach 1:
The polymer shell is formed preliminarily during the encapsulation process through interfacial polymerization, creating a pre-stabilized structure before incorporation into the final detergent formulation. This preliminary action eliminates the need for complex stabilization measures in the final formulation, resolving the contradiction between aqueous stability and formulation complexity.
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 encapsulated additive exhibits enhanced hydrolytic stability and high encapsulating efficiency, ensuring the active remains effective over time and is released upon triggering events like washing, such as in a washing machine.
Implementation Method 1
the interfacial polymerization reaction product of a (poly)isocyanate and a polyamine
Implementation Method 2
providing an oil phase comprising an active, a solvent, a (poly)isocyanate; providing an aqueous phase comprising water and an emulsifier; mixing the oil phase and the aqueous phase to provide an emulsion
Implementation Method 3
TAED, when used without modification, is not ideal as an active for an aqueous detergent formulation
Data Source
AI summary
An additive consisting of an active, the active consisting of one or both of tetraacetylethylenediamine or triacetylethylenediamine; and the interfacial polymerization reaction product of a (poly)isocyanate and a polyamine. A method of preparing a water dilution-responsive additive comprising providing an oil phase comprising an active, a solvent, a (poly)isocyanate; providing an aqueous phase comprising water and an emulsifier; mixing the oil phase and the aqueous phase to provide an emulsion; providing a polyamine to the emulsion.