Self-Healing, REpairing Coatings
SHREC
SIM User Forum 27/10/2015 Dirk Bontinck - Allnex
Self-healing 10-25 µm coatings through micro-encapsulation of SH compounds
Coating Resin Technology
Micro-encapsulation Technology
Surface Characterization
High Throughput Platform
Coated Metal Wires
Steel Protection
Can MF systems encapsulate a wide variety of SH compounds?
Can we have access to 4-8 µm capsules? What is the size distribution?
Do we have proof that there is content in the microcapsules?
Can we obtain homogeneous dispersions of µcaps in formulations?
Are microcapsule slurries developing agglomerates over time?
Can microcapsules be delivered in organic media?
What % of microcapsules is still intact after formulation/application?
Can High Throughput Technology be used to accelerate development?
Can we prove that the SH content emerges upon scratching?
Do we have analytical tools to demonstrate self-healing?
Is the formaldehyde emission complying with legislation?
Burning Questions for SHREC
Fluorescence microscopy
Visualizing the core after scratching: pyrene in microcapsules
AFM: Force Distance Measurement
5 µN
1 µN
• Force needed to break capsules: 2-3 µN
• 20 times 1 µN does not break them
• Microcapsule architecture to be tuned
Raman visualization of SH compound in healed cracks (blue = coating; red = SH)
Optical Microscopy (OM) – Reflection mode
Profilometry (Stylus mode)
High Througput Platform for Encapsulation Chemistry Screening
Effect of MBT loaded LDH containers in Ucecoat 7689
Electrochemical Impedance Spectroscopy (EIS)
Effect of MBT loaded LDH containers in Ucecoat 7689
Scanning Vibrating Electrode Technique (SVET)
How far does the core leach out of the microcapsules?
RT
Raman Spectroscopy
Can MF systems encapsulate a wide variety of SH compounds?
Can we have access to 4-8 µm capsules? What is the size distribution?
Do we have proof that there is content in the microcapsules?
Can we obtain homogeneous dispersions of µcaps in formulations?
Are microcapsule slurries developing agglomerates over time?
Can microcapsules be delivered in organic media?
What % of microcapsules is still intact after formulation/application?
Can High Throughput Technology be used to accelerate development?
Can we prove that the SH content emerges upon scratching?
Do we have analytical tools to demonstrate self-healing?
Is the formaldehyde emission complying with legislation?
Burning Questions for SHREC
XL density
100% UV
PUD
Commercial &
Academic
Holy Grail
Self Healing-landscape
wb-UV
Visual Self Healing