Renewable Polyurethane Microcapsules with Isosorbide Derivatives for Self-Healing Anticorrosion Coatings

Abstract

Renewable polyurethane microcapsules containing isosorbide derivatives for self-repairing anticorrosion coatings were easily manufactured by interfacial polymerization of a dimer ester–diisocyanate (DE–TDI) prepolymer derived from waste vegetable oil and 1,4-butanediol (BD) as a chain extender using ultrasonication. Two kinds of corrosion inhibitors were also synthesized by the ring-opening reaction of succinic anhydride (SA) or maleic anhydride (MA). Microcapsules having 11–38 μm in diameter were obtained, and the typical core content of microcapsules was around 40–45 wt %. Salt spray tests used for evaluating self-healing anticorrosion coating systems showed significant rust retardancy, depending on the content of the isosorbide derivatives for corrosion control.

Structural and thermal properties of poly(1,4-cyclohexane dimethylene terephthalate) containing isosorbide

“…With such characteristics, ISB has been used to synthesize various polyesters, [20][21][22][23][24][25][26][27] epoxy adhesives, [28][29][30] polyurethanes, [31][32][33][34] polycarbonates [35][36][37][38] and medicines. It is one of the promising biomass monomers derived from glucose and it has a diol structure suitable for conden-sation reactions.…”

Microencapsulation of quinoline as a corrosion inhibitor in polyurea microcapsules for application in anticorrosive PU coatings

“…Additionally the possibility of leaching of the corrosion inhibitors due to the effect of the surrounding electrolytic environment cannot be discounted. Thus in order to achieve maximum corrosion inhibition ability and extend the active protection of polymeric coatings, encapsulation of inhibitors inside micro or nanoreservoirs is an effective way to store the inhibitor, thereby maintaining its efficiency [10][11][12]. Such reservoirs not only avoid the deactivation of corrosion inhibitors but also prolong the corrosion inhibition ability by controlled release of the inhibitor.…”

“…Microcapsule loaded systems with the possibility of controlling the shell properties have been applied successfully to recover the barrier properties of cracked coating surfaces or to release active corrosion inhibitor to inhibit corrosion activity of affected area on the metal surface. Although microcapsules containing different healing agents are reported to be used for corrosion protection, there are only a few studies about microcapsules based on organic corrosion inhibitors [10,11].…”

Self‐healable and thiol–ene UV‐curable waterborne polyurethane for anticorrosion coating

“…So far, numerous strategies have been applied to the preparation of self‐healing coatings for metal protection, which can be mainly divided into extrinsic and intrinsic types. In the case of the former, either corrosion inhibitor, flax seed oil or reactive monomer is microencapsulated in tiny containers and then embedded in coating. When the coating is damaged, the capsules are broken and the healant is released to repair the cracks.…”