Phosphate Ester Microcapsule Shell Wall Formation
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Solution Overview
Problem
Existing microcapsules suffer from poor encapsulation yields, high permeability, and low compatibility with core materials due to their mechanical weakness and permeability issues, limiting their effectiveness in controlled release and stability applications.
Innovation Solution
A method of forming microcapsules using a lipophilic phase and an aqueous phase, where the lipophilic phase includes a phosphate ester insoluble in the aqueous phase and a core material miscible with it, and a multivalent ion in the aqueous phase, leading to the formation of a shell wall around droplets at the phase boundary, resulting in microcapsules with improved mechanical properties and reduced permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional microcapsule formation methods are used, then the microcapsules can be produced, but they exhibit poor encapsulation yields and high permeability
Solution Approach 1:
The patent changes the chemical parameters of the shell wall material by using phosphate esters with specific molecular structures and controlling the polymerization conditions (pH, temperature, monomer ratios) to achieve optimal encapsulation yield and permeability characteristics
Solution Approach 2:
The patent employs composite shell wall structures formed by polymerizing multiple phosphate ester monomers together, creating a composite material that simultaneously improves encapsulation efficiency and controls permeability through synergistic effects of different monomer components
2Strength
If conventional microcapsule shell materials are used, then the microcapsules can be formed, but they exhibit low mechanical strength
Solution Approach 1:
The patent optimizes polymerization parameters including crosslinking density, monomer concentration, and reaction conditions to enhance the mechanical strength of the shell wall while maintaining manufacturability through controlled reaction kinetics
Solution Approach 2:
The patent creates composite phosphate ester polymer networks that provide enhanced mechanical strength through intermolecular crosslinking and structural reinforcement, while the liquid crystal phase formation during polymerization ensures uniform shell wall formation
3Adaptability or versatility
If conventional microcapsule materials are used, then the microcapsules can be produced, but they show low compatibility with core materials
Solution Approach 1:
The patent designs phosphate ester monomers with functional groups that can interact with various types of core materials through multiple mechanisms (hydrogen bonding, dipole interactions, van der Waals forces), making the shell wall material universally compatible with diverse core materials while maintaining high encapsulation efficiency
Solution Approach 2:
The patent adjusts the chemical composition parameters of the phosphate ester monomers (substituent groups, chain length, functional groups) to optimize compatibility with specific core materials, and controls polymerization kinetics to ensure uniform encapsulation
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 approach enhances the mechanical strength and reduces permeability of microcapsules, improving their compatibility with core materials and encapsulation efficiency, enabling better controlled release and stability of encapsulated materials.
Implementation Method 1
forming a shell wall around each of the one or more droplets at the phase boundary between the lipophilic phase and the first aqueous phase
Implementation Method 2
Microcapsules having shell walls formed of phosphate ester salts
Data Source
AI summary
Microcapsule slurries can be formed from a phosphate ester and a multivalent ion. The microcapsules can encapsulate a core material misicible with the phosphate ester. The phosphate ester can be lipophilic and insoluble in aqueous solutions.