Abstract
Polymer based nanocapsule was developed using core-cell approach, where the core material was methyl diphenyl diisocyanate and the cell material was urea-formaldehyde. The synthesized capsules of 100 to 800 nm size were incorporated into sol-gel matrix to prepare a final coating for steel protection. This coating was found protecting the steel at the damage or crack locations in 3.5% NaCl solution. SEM micrographs confirmed healing of the coating at the damage or crack points.
Highlights
Having been inspired by nature, coating designers are trying to convert the traditional coating into the “smart or intelligent” coating
Aggregation, and nanocapsule sizes were observed by scanning electron microscope (SEM)
Capsule size analysis was performed by SEM; the capsule’s size fall in a wide range of 20–250 micrometer without the application of ultrasonicator
Summary
Having been inspired by nature, coating designers are trying to convert the traditional coating into the “smart or intelligent” coating. Since the damage deep inside material is difficult to perceive and to repair in particular, the material would be motivating to have ability of selfrepairing through various stimuli response based on physical, chemical, mechanical, or thermal means which trigger the healing process These progresses have opened an age of new intelligent materials. Conventional barrier protective coating when gets damaged during transportation or fabrication process, cracks or pin hole develops on the damaged area and localized corrosion initiates at that area and gradually propagates to other areas These types of difficulties in repairing damaged area were well taken care of by scientists, by designing intelligent coatings using core-cell approach. Present research work emphasized on the development of a methyl diphenyl diisocyanate based nanosize capsule and incorporation of nanocapsule and corrosion resistance pigments like nanolamellar zinc flake into a titania based solgel coating matrix to generate the self-healing and corrosion resistance coating on steel substrate (see Table 1)
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