Microcapsule Core-Shell Structure for Selective Oil Release
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Solution Overview
Problem
Conventional methods for producing microcapsules struggle with selective oil release and preventing oil volatilization, leading to instability during storage and distribution, especially for fragrance oils and oils for color formation.
Innovation Solution
A method involving the mixing of an aqueous dispersion of hydrophilic inorganic nanoparticles with a melamine-based monomolecular compound to form organic/inorganic composite particles, followed by the creation of an oil-in-water pickering emulsion and a polycondensation reaction with a melamine-formaldehyde precondensate to produce a microcapsule with a core-shell structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional methods use monomolecular or polymer type surfactants to form emulsion droplets and perform polycondensation reaction, then initial oil loading capacity and efficiency are improved, but oil release cannot be blocked during storage and distribution
Solution Approach 1:
The patent uses composite particles comprising both organic components (melamine-based monomolecular compound) and inorganic components (hydrophilic inorganic nanoparticle) to form the capsule film. This composite structure combines the advantages of both material types: the organic component provides good oil loading capacity while the inorganic component provides stable emulsion formation and controlled release properties, resolving the contradiction between high oil loading and reliable release control during storage
2Strength
If melamine-formaldehyde resin is used with anionic polymer emulsifier, then mechanical and thermal stability are improved, but material permeability of capsule film becomes high causing unstable oil loading
Solution Approach 1:
The capsule film is formed as a composite of organic and inorganic components where the inorganic hydrophilic nanoparticle provides low material permeability for stable oil loading, while the organic melamine-based compound maintains mechanical and thermal stability. This composite approach resolves the contradiction by combining materials with complementary properties
3Stability of the object's composition
If inorganic nanoparticles are used to form pickering emulsion, then emulsion stability is improved, but random leakage of collected molecules occurs due to porosity of capsule
Solution Approach 1:
The patent creates a composite capsule film where inorganic nanoparticles provide emulsion stability while organic components fill the pores and reduce material permeability. This composite structure prevents random leakage of encapsulated molecules while maintaining the emulsion stability provided by the inorganic nanoparticle core, resolving the contradiction between stability and leakage prevention
4Ease of manufacture
If conventional methods are used, then manufacturing process is simple, but selective oil release and prevention of oil volatilization cannot be achieved
Solution Approach 1:
The patent uses a composite emulsifier system combining organic and inorganic components that can be integrated into existing manufacturing processes. The composite structure provides selective release capabilities and volatilization prevention through its dual-nature composition, maintaining ease of manufacture while achieving enhanced functional performance
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 method enables the preparation of microcapsules that can selectively release oils while preventing volatilization, thereby maintaining long-term performance and improving storage stability of the encapsulated oils.
Implementation Method 1
mixing an aqueous dispersion of hydrophilic inorganic nanoparticles with an aqueous solution of a melamine-based monomolecular compound to prepare an aqueous dispersion of organic/inorganic composite particles in which melamine is bonded to a surface of the hydrophilic inorganic nanoparticles by electrostatic attraction
Implementation Method 2
adding an oil to the aqueous dispersion of organic/inorganic composite particles to form an oil-in-water pickering emulsion
Implementation Method 3
adding a melamine-formaldehyde precondensate to the oil-in-water pickering emulsion, and performing a polycondensation reaction
Data Source
AI summary
The present disclosure provides a method for preparing a microcapsule and a microcapsule prepared thereby capable of selective release of oils and preventing volatilization of oils while maintaining long-term performance by improving storage stability of the oil contained in the capsule.