Microcapsule Shell Stability via Formaldehyde Scavenger
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Solution Overview
Problem
Microcapsules encapsulating water-insoluble compounds with amino resins lose their ability to release the core material when stored in a dry state, particularly when exposed to seawater, as described in existing methods.
Innovation Solution
Incorporating a formaldehyde scavenger into the microcapsule composition, where the core is surrounded by an amino resin shell, helps maintain the release capability of the water-insoluble compound even after dry storage by stabilizing the amino resin and preventing the degradation of the shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microcapsules are made using amino resin shell without formaldehyde scavenger, then manufacturing is simpler and cost is lower, but the microcapsules lose their ability to release core material after dry storage
Solution Approach 1:
A formaldehyde scavenger is introduced as an intermediary substance within the amino resin shell to counteract the harmful effects of formaldehyde release during dry storage. The scavenger captures formaldehyde, preventing it from degrading the shell structure and maintaining the microcapsule's ability to release core material when needed.
Solution Approach 2:
The formaldehyde scavenger is incorporated into the amino resin shell during the manufacturing process, performing a preliminary protective action before the microcapsules are subjected to dry storage conditions. This preemptive measure ensures the shell remains stable and functional throughout storage and subsequent use.
2Reliability
If formaldehyde scavenger is added to microcapsule composition, then release capability is maintained after dry storage, but manufacturing complexity and cost increase
Solution Approach 1:
The formaldehyde scavenger is combined with the amino resin and core material during the microcapsule formation process, integrating multiple functions into a single manufactured product. This merging approach maintains reliability while consolidating the manufacturing steps rather than requiring separate treatment processes.
3Stability of the object's composition
If amino resin shell is used without formaldehyde scavenger, then manufacturing process is simpler, but shell degrades during dry storage eliminating release ability
Solution Approach 1:
The formaldehyde scavenger acts as a protective intermediary within the amino resin shell, capturing formaldehyde molecules that would otherwise cause degradation. This maintains shell stability and structural integrity throughout dry storage while preserving the microcapsule's functional properties.
Solution Approach 2:
The formaldehyde, which would normally be a harmful byproduct causing shell degradation, is converted into a beneficial situation by having it captured and neutralized by the scavenger. The potential harm is transformed into an opportunity to demonstrate the scavenger's protective function and maintain shell stability.
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 use of formaldehyde scavengers in the microcapsule composition ensures that the core material is effectively released over time, even after storage, enhancing the stability and performance of the microcapsules in seawater environments.
Implementation Method 1
one or more reaction product of said amino resin with a formaldehyde scavenger
Implementation Method 2
the water-insoluble compound will be gradually released into the water
Data Source
AI summary
A composition is provided, comprising microcapsules, wherein said microcapsules comprise a core and an outer shell, wherein said core comprises one or more water-insoluble compound having melting point above 15° C., wherein said outer shell comprises one or more amino resin that is a reaction product of reactants comprising one or more polyamine and formaldehyde, and wherein said composition further comprises one or more formaldehyde scavenger, one or more reaction product of said amino resin with a formaldehyde scavenger, or a mixture thereof. Also provided is a method of making such a composition.