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Sunday, 21 April 2019
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Raw materials & technologies, Technologies

Self-healing of an epoxy coating through linseed oil and its alkyd microcapsules

Tuesday, 9 April 2019

In order to produce to produce self-healing coating, microcapsules having either linseed oil or its alkyd have been incorporated into an epoxy matrix

Microcapsules having either linseed oil or its alkyd have been incorporated into an epoxy matrix. Image Source: iprachenko - stock.adobe.com.

Microcapsules having either linseed oil or its alkyd have been incorporated into an epoxy matrix. Image Source: iprachenko - stock.adobe.com.

In a present study, microcapsules (MCs) having either linseed oil (LO) or its alkyd (LO-Alkyd) have been incorporated into an epoxy matrix to produce self-healing coating. The epoxy film itself has a Yellowness Index (YI) of 2.81, while LO and LO-Alkyd MCs loaded epoxy films have YI 44.87 and 21.98, respectively.

Capsule embedding does not disturb the continuity of the film

Their SEM micrographs reveal that capsule embedding does not disturb the continuity of the film thanks to the successful interfacial capsule-epoxy adhering. LO and LO-Alkyd MCs incorporation reduced the strength of adhesion of the epoxy coating to the metal surface up to 34% and 39%, respectively. The water vapor permeability of epoxy film increased 8% and decreased 43%, by addition of LO and LO-Alkyd MCs, respectively. Electrochemical Impedance Spectroscopy revealed that the impedance of the films increased by the addition of capsules into the epoxy.

The study has been published in: Progress in Organic Coatings Volume 129, April 2019, Pages 292-299.

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