Self-healing adhesive with flexible capsules
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Solution Overview
Problem
Existing self-healing adhesives face limitations due to the need for a different base adhesive system to prevent unintentional curing, potential shortening of service life, and the requirement for uniform dispersion of healing agents and curing agents, which restricts their application range and reliability.
Innovation Solution
A self-healing material comprising a base material mixed with a first capsule having a flexible outer shell and a second capsule with a fluid that cures upon contact, both formed from materials with an elastic modulus of 20 MPa to 85 MPa, such as gelatin or melamine, allowing for flexible deformation and reliable rupture upon crack occurrence, facilitating healing without premature curing or fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a curing agent is added to the base adhesive to enable self-healing, then self-healing capability is improved, but the adhesive may be unintentionally cured or thickened before use, limiting the range of application
Solution Approach 1:
The patent divides the self-healing system into separate capsules (healing agent capsules and curing agent capsules) that are dispersed in the base adhesive. This segmentation prevents the curing agent from contacting the base adhesive prematurely, eliminating unwanted thickening or curing before use, while still enabling self-healing when capsules rupture at crack sites.
2Reliability
If a large amount of capsules and curing agents are dispersed uniformly in the base adhesive to ensure sufficient mixing upon crack occurrence, then self-healing effectiveness is improved, but the complexity of uniform dispersion increases
Solution Approach 1:
The patent uses flexible capsules with elastic modulus of 20-85 MPa that can deform under stress. This flexibility allows the capsules to move and distribute themselves more easily within the base adhesive, facilitating uniform dispersion without requiring complex mixing processes, while still ensuring sufficient curing agent release when cracked.
3Strength
If the outer shell material has high elasticity to allow flexible deformation, then the capsule can withstand stress without premature rupture, but the shell may not rupture reliably when crack occurs
Solution Approach 1:
The patent optimizes the elastic modulus parameter of the outer shell material to a specific range (20-85 MPa). This parameter change creates a balanced state where the shell is flexible enough to deform and absorb stress without premature rupture, yet brittle enough to rupture reliably when subjected to crack-induced stress, enabling controlled self-healing activation.
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 solution enables reliable self-healing of cracks with improved productivity and flexibility, maintaining adhesive strength and extending the lifespan of the self-healing material, even under stress and temperature changes, while allowing for accurate mixing ratios and distribution of healing agents.
Implementation Method 1
a first outer shell having flexibility and a first fluid encapsulated in the first outer shell... a second outer shell having flexibility and a second fluid that is encapsulated in the second outer shell
Data Source
AI summary
To provide a self-healing material having excellent productivity and self-healing properties. A self-healing material according to the present technology includes: a base material; a first capsule; and a second capsule. The first capsule includes a first outer shell having flexibility and a first fluid encapsulated in the first outer shell, and is mixed with the base material. The second capsule includes a second outer shell having flexibility and a second fluid that is encapsulated in the second outer shell and to be cured by contact with the first material, and is mixed with the base material.