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SELF-HEALING COATING AGAINST MICRO-SCRATCHES


Abstract

Scientists from Saarland University and the INM-Leibniz Institute for New Materials developed an innovative, transparent and self-healing coating which is capable of repairing micro-scratches at mild temperatures between 80-100 °C within a few minutes.


Background

Superficial micro-scratches, for example on topcoats or other high-gloss surfaces, lead to serious value losses of high-quality products. Therefore, the development of protective and self-healing surface-coatings is very interesting for a variety of industrial branches.


Images & Videos


Solution

Scientists from Saarland University and the INM-Leibniz Institute for New Materials developed an innovative, transparent and self-healing coating which is capable of repairing micro-scratches (Image A). The recovery takes place at mild temperatures between 80-100 °C within a few minutes and is based on the so-called polyrotaxane-slide-ring gels (Image B). Ring-shaped cyclodextrin-molecules (derivatives of maize starch) are threaded in a movable fashion on polymer-chains while built-in stopper-molecules prohibit the release of the rings. By cross-linking of the threaded cyclodextrins slide-ring gels are obtained. Due to the mobility of the molecules the material can heal small scratches. By incorporating specific nanoparticles mechanical stability and weather resistance of the material can be further increased.


Advantages

  • Self-healing in a 1 - 3 minutes at temperatures between 80 and 100°C
  • Thin-film technology, i.e. low material consumption
  • Cyclodextrin as bio-based raw material (from corn starch)
  • Synthesis of the cyclodextrin-polyrotaxane performed in an aqueous milieu
  • Higher mechanical stability and weather-resistance is possible by incorporation of nanoparticles
  • A new synthesis method makes even hydrophobic polymers accessible for the polyrotaxane synthesis

Scope of application

  • transparent (pigmentable where required) protective coating for painted surfaces, different metals, plastics
  • Spray coating, dip coating
  • Potential for adaptation to various application areas

Service

Looking for co-operation partner and/or licensee for the implementation in pilot scale / industrial scale and for adaptation for specific fields of application 


Universität des Saarlandes Wissens- und Technologietransfer GmbH

Dr. Nicole Comtesse
0681 302-6340
nicole.comtesse@uni-saarland.de
www.wut-uni-saarland.de
Address
Universität des Saarlandes Wissens- und Technologietransfer GmbH Starterzentrum | Gebäude A1 1
66123 Saarbrücken



Development status

Laboratory model


Patent situation

  • WO um WO2016202906 mit Anmeldungen in EP, US, JP und KR pending
  • WO WO2018115238 mit Anmeldungen in EP und USA pending
  • WO pending

Keywords

self-healing, coating, slide-ring gels, polyrotaxane, cyclodextrin

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