Microencapsulated Biocidal Coatings for Self-Healing Substrates
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional protective coatings on porous substrates like wood and concrete fail to maintain biocidal activity at sites of damage, as biocidal agents leach away or are not effectively retained, allowing biomatter to grow and cause further damage.
Innovation Solution
Microencapsulated biocidal formulations containing hydrophobic biocidal agents and film-forming agents that rupture and release their contents at damage sites, where the film-forming agents polymerize to anchor the biocidal agents, maintaining activity and preventing biomatter growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective coatings are applied to substrates, then mechanical protection is provided, but biocidal activity is lost at damage sites due to leaching
Solution Approach 1:
The coating system is segmented into microcapsules containing biocidal agents and film-forming agents. These microcapsules are dispersed throughout the coating matrix, allowing localized release of biocidal activity at damage sites while maintaining overall coating integrity and preventing widespread leaching.
Solution Approach 2:
The coating is pre-loaded with microcapsules containing both biocidal agents and film-forming agents before application. When damage occurs, these pre-positioned microcapsules rupture and automatically release their contents to reform protective barriers, eliminating the need for post-damage intervention.
2Reliability
If biocidal agents are incorporated into protective coatings, then biomatter growth is prevented, but the coating loses mechanical integrity over time
Solution Approach 1:
Biocidal agents are encapsulated in discrete microcapsules rather than being uniformly mixed into the coating matrix. This segmentation prevents the biocides from degrading the overall coating structure while maintaining mechanical integrity, as the encapsulated agents only interact with the substrate at localized release points.
Solution Approach 2:
The microcapsules are enclosed in flexible shells that can withstand the mechanical stresses applied to the coating. These shells maintain coating integrity under normal conditions but rupture when subjected to damage, releasing biocidal agents only when needed and preserving the coating's structural strength.
3Strength
If protective coatings are designed to be durable, then mechanical resistance is improved, but damage sites become vulnerable to biomatter growth
Solution Approach 1:
The coating system performs self-repair at damage sites through microcapsules containing film-forming agents. When the durable coating is damaged, these microcapsules rupture and release agents that automatically reform the protective barrier, eliminating vulnerable exposed substrate areas without requiring external intervention.
Solution Approach 2:
The coating incorporates microcapsules with biocidal agents that proactively counteract biomatter growth threats. Upon damage, these pre-positioned agents are released to immediately neutralize potential biomatter contamination, preventing the establishment of harmful growth before it can occur.
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 effectively retains biocidal agents at damage sites, preventing biomatter growth and extending the longevity of biocidal activity, even in exposed environments, by forming a solidified film that immobilizes the biocidal agents, thus protecting the substrate.
Implementation Method 1
the film-forming agents polymerize to anchor the biocidal agents, maintaining activity and preventing biomatter growth
Implementation Method 2
the microcapsule has a shell wall that ruptures when the protective material (e.g., the coating, stain, sealant or adhesive, generally referred to as the matrix) in which the microcapsule is incorporated is damaged
Data Source
AI summary
Disclosed are biocidal self-healing protective materials, including coatings, stains, sealants, and adhesives. The biocidal protective materials may include a first microcapsule that includes a hydrophobic film-forming agent and a hydrophobic biocidal agent. Upon rupture of the first microcapsule, the hydrophobic film-forming agent may form a polymerized film that includes the hydrophobic biocidal agent. The biocidal protective materials may include a second microcapsule that may include a curing agent. Upon rupture of the first and second microcapsules, the curing agent may cause the hydrophobic film-forming agent to form a polymerized film that includes the hydrophobic biocidal agent. Also disclosed are protective materials that include a polymeric material matrix and the first and/or second microcapsules, as well as methods of increasing the biocidal activity of a protective material and methods of increasing a biocidal activity of a porous substrate.