Amine modified polysaccharide urethan/urea microcapsules
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Solution Overview
Problem
Existing microencapsulation technologies face challenges in simplifying the process, improving microcapsule wall performance and durability, enhancing adherence and deposition, and ensuring degradability, particularly in the use of starch-based materials.
Innovation Solution
The development of amine modified polysaccharide microcapsules formed through an interfacial polymerization process using amine modified polysaccharides, such as hydrophobically modified starch, reacted with isocyanates to create cross-linked polyurethanes and polyureas, with specific mole and weight ratios of reactants to enhance shell formation and control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If starch-based materials are used for microencapsulation, then degradability is improved, but manufacturing complexity and process simplification are worsened
Solution Approach 1:
The patent uses composite materials by combining starch-based polysaccharides with isocyanate crosslinking agents to form a polyurethane/polyurea shell. This composite approach maintains the degradability benefit of starch while adding crosslinking functionality to simplify the encapsulation process and improve shell durability.
Solution Approach 2:
The patent modifies the chemical parameters of starch by introducing amino groups through reaction with isocyanates. This parameter change transforms ordinary starch into amine-modified polysaccharides that can undergo interfacial polymerization, thereby simplifying the manufacturing process while retaining biodegradability.
2Strength
If amine modified polysaccharides are used, then shell strength and durability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent performs preliminary modification of starch by introducing amino groups before the main encapsulation process. This preliminary action creates amine-modified polysaccharides that readily react with isocyanates during interfacial polymerization, thereby strengthening the shell without adding complexity to the main encapsulation steps.
Solution Approach 2:
The patent replaces mechanical mixing and physical encapsulation methods with chemical interfacial polymerization. The chemical reaction between amine-modified polysaccharides and isocyanates automatically forms a strong shell at the interface, eliminating the need for complex mechanical assembly processes.
3Reliability
If interfacial polymerization is used, then adherence and deposition are improved, but process complexity increases
Solution Approach 1:
The patent uses amine-modified polysaccharides as an intermediary substance that facilitates the reaction between the aqueous phase and organic isocyanate phase. This intermediary forms a stable interface that promotes uniform shell deposition and strong adherence without requiring complex process control.
Solution Approach 2:
The patent exploits phase transition during interfacial polymerization where the reaction product transitions from soluble to insoluble, forming a solid shell at the interface. This natural phase transition simplifies the deposition process by automatically forming the capsule wall without additional processing steps.
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 resulting microcapsules exhibit improved physical properties, controlled release of benefit agents, and enhanced degradability, making them suitable for various applications.
Implementation Method 1
Interfacial polymerization is a process wherein a microcapsule wall of polyamide, an epoxy resin, a polyurethane, a polyurea or the like is formed at an interface between two phases
Implementation Method 2
reacted with isocyanates to create cross-linked polyurethanes and polyureas
Data Source
AI summary
Core shell microcapsules are provided wherein the capsule shell is the reaction product of a polysaccharide, an amine or an aminating agent, and an isocyanate.