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Home  > Raw materials & technologies  > Technologies  > Functional coatings  > Filled microcapsules provide self-healing...

Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Filled microcapsules provide self-healing in coatings

Monday, 30 April 2012

Protective coatings prevent structures from harmful environmental effects like UV-light degradation and corrosion. Additional stress in coated elements (e.g. induced by production processes) can result in cracks in the coating which in turn leads to a weakening of the structure. Furthermore, corrosive media reach the substrate surfaces and cause damage.

Functional coatings are used in a lot of applications. Microcapsulations are one basic technology.

Source: Pixelio/BirgitH

Functional coatings are used in a lot of applications. Microcapsulations are one basic technology.

Source: Pixelio/BirgitH

Substrates can be protected with self-healings coatings from corrosion by healing even non-visible cracks and by stopping the crack growth. Self-healing coatings thereby contribute to prolong the maintenance cycles and the life span of structures.
The department "Paint Technology” at Fraunhofer IFAM deals since several years with the development of self-healing coatings with filled microcapsules. When cracks in the coating occur, the microcapsules break and the healing agent flows into the crack to cure the damage or at least seal the crack. The development of self-healing coatings with filled microcapsules includes several challenges. The microcapsules have to be distributed effectively in the coating matrix, but must be resistant to applied shear force during formulation. Furthermore, the choice of suitable healing agents, the compatibility with the coating matrix and the concentration of the capsules in the matrix are just a few topics which have to be investigated.
Sabine Scharf, from IFAM will show in her talk at the European Coatings Conference "Functional coatings” an overview of self-healing coatings and their fields of application. Additionally, first experiences and results of the development of self-healing coatings will be presented.

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