Biodegradable Microcapsules via Pickering Emulsion Polymerization
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Solution Overview
Problem
Existing fragrance microcapsules face issues with weak fiber adhesion and environmental sustainability due to swelling in water and non-biodegradability, which affects their fragrance supporting force and durability.
Innovation Solution
A method involving the adsorption of acrylic monomers on inorganic nanoparticles, followed by polymerization with fragrance oil and additional amine-based monomers to form inorganic nanoparticles-acryl resin complex microcapsules, which enhances fiber adhesion and biodegradability, ensuring stability in water and improved fragrance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If surfactant polymer or nanoparticles are used to form emulsion liquid drops for fragrance microcapsules, then excellent fragrance supporting force and supporting efficiency are achieved, but the capsules are not degraded after use, causing environmental problems
Solution Approach 1:
The patent changes the chemical composition parameters by using biodegradable polymers (polyacrylic acid, polyacrylamide) instead of conventional non-biodegradable polymers, while maintaining the microcapsule structure and fragrance supporting function through controlled polymerization and crosslinking
Solution Approach 2:
The patent creates composite microcapsules combining biodegradable polymers with fragrance oils and crosslinking agents, forming a structure that maintains strength for fragrance support while enabling biodegradation through hydrolysis of ester groups and amide bonds
2Object-generated harmful factors
If biopolymer (gum arabic, starch, cellulose, gelatin, alginate, albumin) and modified biopolymer are used to prepare fragrance microcapsules, then biodegradability is improved, but the polymers may be swollen by water or fragrance oil, resulting in very weak fragrance supporting force
Solution Approach 1:
The patent modifies the polymer parameters by introducing crosslinking agents that form three-dimensional networks, changing the physical state from swollen to contracted, thereby maintaining fragrance supporting force while preserving biodegradability through hydrolyzable bonds
Solution Approach 2:
The patent creates composite structures combining biodegradable polymers with crosslinking agents and fragrance oils, where the crosslinked network prevents swelling while the hydrolyzable bonds maintain biodegradability, achieving both strength and environmental friendliness
3Stability of the object's composition
If pickering emulsion using hydrophilic silica nanoparticles and dialkyl adipate is prepared, then emulsion stability is improved, but the emulsion is vulnerable to surrounding environment (acid, base, temperature), being easily destroyed, making it difficult to prepare desired microcapsules and lowering fiber adhesion
Solution Approach 1:
The patent changes the chemical stability parameters by using biodegradable polymers with crosslinking structures that resist environmental factors like acid, base, and temperature, while maintaining emulsion stability through controlled polymerization and crosslinking during the microcapsule formation process
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 produces microcapsules with enhanced fiber adhesion and fragrance supporting force, maintaining durability and environmental friendliness by controlling surface charge and utilizing biodegradable ester groups, thus addressing the limitations of previous methods.
Implementation Method 1
adsorbing acrylic monomers having water solubility of 1 to 100 g/L on the surface of inorganic nanoparticles
Implementation Method 2
polymerizing the mixture of the step 2 (step 3)
Data Source
AI summary
There is provided a method for preparing surface modified microcapsules that increase fiber adhesion of fragrance capsules, have excellent fragrance durability even after use, and are environmentally friendly due to biodegradation of ester groups, by preparing a pickering emulsion using inorganic nanoparticles and acrylic monomers comprising biodegradable ester groups, and then, preparing capsules through the polymerization thereof, and modifying the surface of the capsules with amine-based monomers.