Preparation of linseed oil-loaded porous glass bubble/wax microcapsules for corrosion- and wear-resistant difunctional coatings

Abstract

A novel type of double-shell-structured linseed oil-loaded microcapsules was fabricated by environmentally friendly microencapsulation to prepare corrosion- and wear-resistant difunctional coatings. Porous glass bubbles were first prepared by subcritical water treatment and used as a container for linseed oil. Wax was used as an outer coating to prevent leakage of the linseed oil. The average diameter, shell thickness, thermal stability, double-shell structure and core content of the linseed oil-loaded@porous glass bubble/wax microcapsules, as well as the porous structure and cavity of the glass bubbles were investigated. The difunctional self-healing corrosion- and wear-resistant coatings were developed based on the microcapsules, and the self-healing and wear-resistant performance were optimized systematically. Epoxy coatings with 10 wt% linseed oil-loaded@porous glass bubble/wax microcapsules exhibited optimal anticorrosion and wear-resistant properties. The impedance modulus at 0.01 Hz was power of three higher than that of a pure epoxy coating after 15 days of immersion in 3.5 wt% salt solution. The friction coefficient and wear loss decreased by 87.9% and 96.3%, respectively, compared with pure epoxy coatings.