Polyamine-Acrylic Core-Shell Microcapsule for Aldehyde-Free Fragrance Release
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Solution Overview
Problem
Current microcapsule technologies, such as melamine-formaldehyde and polyurea microcapsules, face challenges in providing balanced stability and performance, particularly in releasing fragrance effectively during the early stages of cleaning or treatment processes, and are plagued by regulatory concerns due to residual aldehyde or isocyanate residues.
Innovation Solution
The development of core-shell microcapsules with a shell formed by the reaction of polyamine monomers and acrylic monomers at an oil-water interface, forming an aldehyde-free and isocyanate-free thermosetting resin, which allows for easy fracture and controlled fragrance release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If melamine-formaldehyde or polyurea microcapsules are used, then storage stability is improved, but fragrance release performance during early stages of use deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the shell material from conventional melamine-formaldehyde or polyurea to polyamine-acrylic thermosetting resin. This parameter change results in a shell with different mechanical properties that maintains storage stability while enabling easier fracture and better fragrance release during early stages of use.
Solution Approach 2:
The patent uses a composite shell structure formed by the reaction of polyamine and acrylic monomers, creating a thermosetting resin with balanced properties. This composite material provides both the structural integrity needed for storage stability and the controlled fracture characteristics needed for effective fragrance release.
2Reliability
If conventional aminoplast microcapsules are used, then leakage resistance is improved, but they generate harmful aldehyde residues
Solution Approach 1:
The patent extracts and eliminates the harmful aldehyde component from the conventional melamine-formaldehyde system by replacing it with a polyamine-acrylic thermosetting resin system that does not generate aldehyde residues, while maintaining the desired leakage resistance properties.
Solution Approach 2:
The patent replaces the conventional aminoplast chemistry with an alternative polyamine-acrylic system that achieves the same functional performance (leakage resistance) without the harmful byproducts, effectively discarding the problematic aldehyde-based approach.
3Object-generated harmful factors
If polyurea microcapsules are used, then isocyanate residue issues are reduced, but fragrance release performance remains sub-optimal
Solution Approach 1:
The patent changes the shell chemistry parameters from polyurea to polyamine-acrylic thermosetting resin, which eliminates isocyanate residue issues while simultaneously improving fragrance release performance through the unique fracture characteristics of the new shell material.
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
These microcapsules exhibit stability comparable to conventional melamine-formaldehyde capsules while providing enhanced fragrance release during early stages of use, without generating harmful residues, thus addressing regulatory concerns and improving consumer product performance.
Implementation Method 1
a shell formed by the reaction of polyamine monomers and acrylic monomers at an oil-water interface, forming an aldehyde-free and isocyanate-free thermosetting resin
Data Source
AI summary
A core-shell microcapsule comprising a core containing a functional ingredient and a shell surrounding or at least partially surrounding said core, the shell comprising a thermosetting resin formed by the reaction of shell-forming monomers comprising a polyamine and a material comprising a plurality of olefinic double bonds capable of reacting with the polyamine.