Biodegradable Microcapsules with Stabilizer-Treated Barrier Layer
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Solution Overview
Problem
Current biodegradable microcapsules lack the necessary impermeability and stability for high-demand applications such as detergents, cleaning agents, and coatings due to limitations in diffusion, chemical resistance, and temperature resistance, while environmentally friendly options often compromise on biodegradability.
Innovation Solution
The development of biodegradable microcapsules with a multi-layered structure comprising a thin barrier layer and a highly biodegradable stability layer, where the surface of the barrier layer is treated with an emulsion stabilizer, specifically a copolymer containing acrylic acid derivatives, to enhance the deposition and thickness of the stability layer, ensuring robustness and impermeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If biodegradable microcapsules are used, then environmental compatibility is improved, but impermeability and stability deteriorate
Solution Approach 1:
The microcapsule shell is constructed as a composite material system combining biodegradable polymers (gelatin, chitosan, alginate) with synthetic polymers (polyurea, polyacrylate) in a multi-layer structure. This composite approach allows the biodegradable components to provide environmental compatibility while the synthetic components ensure impermeability and stability, resolving the contradiction between these two properties.
Solution Approach 2:
The shell is divided into multiple functional layers: an inner barrier layer for impermeability, a middle stability layer for structural integrity, and an outer biodegradable layer for environmental compatibility. This segmentation allows each layer to optimize its specific function without compromising the overall performance, enabling simultaneous achievement of biodegradability and impermeability.
2Duration of action of stationary object
If natural-substance-based microcapsules are used, then biodegradability is improved, but diffusion impermeability and chemical resistance deteriorate
Solution Approach 1:
The shell combines natural biodegradable substances (gelatin, chitosan, alginate) with chemically resistant synthetic polymers (polyurea, polyacrylate). The natural substances ensure biodegradability while the synthetic polymers provide chemical resistance, resolving the contradiction between these properties through material composition.
Solution Approach 2:
The solution moves from a single-material approach to a multi-layer dimensional structure. Each layer has different thickness and material composition optimized for its specific function, with the biodegradable layers providing environmental compatibility and synthetic layers providing chemical resistance, thus resolving the contradiction through structural dimensionality.
3Reliability
If organic polymers are used, then impermeability and stability are improved, but biodegradability deteriorates
Solution Approach 1:
The shell is segmented into functional layers where synthetic organic polymers (polyurea, polyacrylate) form the inner barrier and stability layers for impermeability and stability, while biodegradable polymers form the outer layer. This segmentation allows each material type to perform its optimal function without compromising the other property.
Solution Approach 2:
Different regions of the shell have different material compositions tailored to local requirements: the inner barrier layer uses synthetic polymers for maximum impermeability, the stability layer uses composite materials for structural integrity, and the outer layer uses biodegradable polymers for environmental compatibility. This local quality differentiation resolves the contradiction between stability and biodegradability.
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 biodegradability and impermeability, making them suitable for various high-demand applications while maintaining environmental compatibility, with a biodegradability of at least 40% within 60 days and maintaining core material integrity over extended storage periods.
Implementation Method 1
the surface of the barrier layer is treated with an emulsion stabilizer, specifically a copolymer containing acrylic acid derivatives, to enhance the deposition and thickness of the stability layer
Implementation Method 2
biodegradable microcapsules with a multi-layered structure comprising a thin barrier layer and a highly biodegradable stability layer, ensuring robustness and impermeability
Data Source
AI summary
According to a first aspect, the invention relates to biodegradable microcapsules, comprising a core material and a shell, wherein the shell consists of at least one barrier layer and at least one stability layer, wherein the barrier layer surrounds the core material, wherein the stability layer comprises at least one biopolymer, and is arranged on the outer surface of the barrier layer, and wherein an emulsion stabilizer is arranged at the transition from barrier layer to stability layer. Furthermore, the invention relates to the use of an emulsion stabilizer to increase the amount of a stability layer that can be deposited on the surface of a barrier layer, a product containing the biodegradable microcapsules, and a method for producing the biodegradable microcapsules.