Biodegradable Coacervate Microcapsules With Stable Controlled Release
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Solution Overview
Problem
Existing microcapsules with non-biodegradable shells contribute to environmental pollution due to microplastic particles, posing risks to ecosystems and human health, and there is a need for microcapsules with improved mechanical and chemical stability without using synthetic resins.
Innovation Solution
A method involving biodegradable polyelectrolytes, such as gum arabic and chitosan, with a crosslinking agent like glutaraldehyde and aromatic alcohols, forms a coacervate shell to create environmentally friendly microcapsules with controlled release properties, ensuring stability and impermeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If non-biodegradable resins (melamine-formaldehyde, urea-formaldehyde, phenol-formaldehyde) are used in microcapsule shells, then mechanical and chemical stability is improved, but environmental friendliness deteriorates due to microplastic pollution
Solution Approach 1:
The patent changes the chemical composition parameters of the shell material from synthetic non-biodegradable resins to natural biodegradable polymers (starch, cellulose, chitosan, gelatin, alginate). This parameter change maintains the necessary mechanical strength and chemical stability while eliminating the harmful environmental effects of microplastic pollution.
Solution Approach 2:
The patent employs composite shell structures combining multiple natural polymers, often with crosslinking agents or surface modifiers. These composite materials achieve the required stability and impermeability properties previously only attainable with synthetic resins, while remaining biodegradable and environmentally friendly.
2Object-affected harmful factors
If biodegradable polyelectrolytes are used instead of synthetic resins, then environmental friendliness is improved, but mechanical and chemical stability may deteriorate
Solution Approach 1:
The patent modifies the physical and chemical parameters of biodegradable polyelectrolytes through controlled crosslinking (using agents like glutaraldehyde, genipin, or calcium ions) and surface modification. These parameter changes enhance the mechanical strength, chemical resistance, and impermeability of the shell while preserving the biodegradable nature of the base polymers.
Solution Approach 2:
The patent creates composite structures by combining biodegradable polyelectrolytes with crosslinking agents, fillers, or surface-coating materials. This composite approach maintains environmental friendliness while achieving the necessary stability and durability for practical applications in personal care and household products.
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 high mechanical and chemical stability, biodegradability, and controlled release, suitable for industrial applications, particularly in personal and home care products, without using non-biodegradable materials.
Implementation Method 1
fostering the polyelectrolytes to form a coacervate
Implementation Method 2
adding at least one crosslinking agent to a composition comprising at least one first solubilised polyelectrolyte
Data Source
AI summary
The present invention is directed to a method for producing advantageous microcapsules. Moreover, the present invention provides microcapsules obtained/obtainable by the method according to the invention.