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