Comparative Study on Microencapsulated of Natural and Waste Sunflower Oil as Self-Healing Agent

Abstract

Microencapsulation of natural vegetable oil as a self-healing agent on metal coating became demanded lately. This paper underlines the microcapsule containing natural and wastes sunflower oil as a self-healing agent that was fabricated for the backbone of corrosion coatings. The results in this paper indicated the distinguished potential of waste sunflower oil as compared to natural sunflower oil. The diameter of microcapsules synthesized from natural sunflower oil and waste sunflower oil both in range of 3-4 µm. The shell of microcapsules microencapsulated from natural sunflower oil showed rough micro-structure while the shell of microcapsules microencapsulated from waste sunflower oil showed smooth micro-structure. The main parameter studied in this research was the varient of stirring speed during the process of microencapsulation. The involvement of stirring speed starts from 200 to 400 rpm. The microcapsules undergo varient of stirring speed analyzed on the yield and core content of microcapsules. The microcapsules from natural produced 29-50% while waste resources bring 26-48% of yield productions. The core content of microencapsulated natural sunflower oil generates 55-64% core content as comparing with waste sources which produce 56-67% of core content. It can be concluded that it was proved that sunflower oil could be considered as an alternative resource for self-healing agent in metal coating either encapsulated from natural or waste raw materials. The incorporation of green and natural material as a self-healing agent significantly influences the sustaining the environment to the safest stage.

The Mechanical Integrity of Self-Healing Coating Embedded with Microencapsulated Vegetable Oil

“…The FESEM imaging shows the mean dimeter of microcapsules was 1 µm, the shell structure of microcapsules was rough, the condition of microcapsules was agglomerated and the high stirring condition during in-situ polymerization method induce the collision of microcapsules in aqueous mixture and create rough shell structure and agglomerated conditions of microcapsules. The rough shell structure allow the microcapsules to generate adhesion integrity during embedment with coating matrix [2,19]. Self-healing performance on scratch.…”

Cobalt (II) used as a catalyst to drying properties of healing agents for self-healing coatings / Cobalto (II) utilizado como catalisador de propriedades de secagem de agentes de cura para revestimentos auto-regenerativos

“…Once the crack occurs, the oil flows into the damaged area where, through reactions between its unsaturated bonds with the atmospheric oxygen, called the oxidative polymerization process [2][3][4][5] , it is capable of forming a solid film, preventing the exposure of the metal to corrosion agents. Linseed oil (LO) is currently reported in many works as one of the most used drying vegetable oils for self-healing purposes [2,5] , although other studies related to the use of soybean [6,7] and sunflower [8] oils are also found. Chia seed oil (CO) is known as Brazilian Journal of Development, Curitiba, v.8, n.2, p. 9723-9740 feb. 2022. the vegetable oil with the highest content of poly(unsaturated) bonds in its fatty acids chains [9] and its applications are no longer restricted to the food industry, due to its increasing crops even in non-Latin American countries [10] .…”