Microcapsule-Type Self-Healing Protective Coating for Cementitious Composites with Secondary Crack Preventing Ability

Kim, Dong-Min; Yu, Hwan‐Chul; Yang, Hye-In; Cho, Yujin; Lee, Kwang-Myong; Chung, Chan‐Moon

doi:10.3390/ma10020114

Cited by 20 publications

(20 citation statements)

References 14 publications

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“…Secondly, the low-temperature self-healing agent needs to be cured at low temperature after filling the damaged region. STP undergoes a condensation reaction of silanol end groups in the presence of DD at room temperature [ 25 ]. In this study, we investigated the low–temperature condensation reaction of STP ( Figure 2 ).…”

Section: Resultsmentioning

confidence: 99%

Low-Temperature Self-Healing of a Microcapsule-Type Protective Coating

et al. 2017

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Abstract:Low-temperature self-healing capabilities are essential for self-healing materials exposed to cold environments. Although low-temperature self-healing concepts have been proposed, there has been no report of a microcapsule-type low-temperature self-healing system wherein the healing ability was demonstrated at low temperature. In this work, low-temperature self-healing of a microcapsule-type protective coating was demonstrated. This system employed silanol-terminated polydimethylsiloxane (STP) as a healing agent and dibutyltin dilaurate (DD) as a catalyst. STP underwent a condensation reaction at −20 • C in the presence of DD to give a viscoelastic product. The reaction behavior of STP and the viscoelasticity of the reaction product were investigated. STP and DD were separately microencapsulated by in situ polymerization and interfacial polymerization methods, respectively. The STP-and DD-loaded microcapsules were mixed into a commercial enamel paint, and the resulting formulation was applied to glass slides, steel panels, and mortars to prepare self-healing coatings. When the self-healing coatings were damaged at a low temperature (−20 • C), STP and DD were released from broken microcapsules and filled the damaged area. This process was effectively visualized using a fluorescent dye. The self-healing coatings were scratched and subjected to corrosion tests, electrochemical tests, and saline solution permeability tests. The temperature of the self-healing coatings was maintained at −20 • C before and after scratching and during the tests. We successfully demonstrated that the STP/DD-based coating system has good low-temperature self-healing capability.

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Section: Resultsmentioning

confidence: 99%

Low-Temperature Self-Healing of a Microcapsule-Type Protective Coating

et al. 2017

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“…Linseed oil was applied to a petri dish and allowed to react for 7 days at room temperature (23)(24)(25)(26)(27) • C) or at −20 • C. Samples were collected periodically and analyzed by FT-IR spectroscopy [6,10]. The degree of conversion of C=C groups of linseed oil was analyzed by an IR band-ratio method.…”

Section: Reaction Conversion Measurementmentioning

confidence: 99%

“…To evaluate preliminarily the applicability of the linseed oil microcapsule-based self-healing coating system to cementitious composite materials, a water sorptivity test was conducted using coated mortar specimens ( Figure 5) [24,25]. Each specimen was prepared by application of the control or self-healing coating formulation to one rectangular side of a square column mortar and by scratching the coated surface of the mortar with two types of cutters.…”

Section: Water Sorptivity Testmentioning

confidence: 99%

Self-Healing Coatings Based on Linseed-Oil-Loaded Microcapsules for Protection of Cementitious Materials

et al. 2018

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Linseed oil undergoes an oxidative drying reaction upon exposure to air, resulting in a soft film. The reaction conversion after 48 h reached 88% and 59% when it reacted at room temperature and −20 °C, respectively. Linseed-oil-loaded microcapsules were prepared using a urea-formaldehyde polymer as the shell wall material. The microcapsules were integrated into a commercially available protective coating formulation to prepare self-healing coating formulations with different capsule loadings. The coating formulations were applied on mortar specimens to prepare self-healing coatings. The effect of capsule loading on adhesion strength of the self-healing coating was studied. The self-healing function of the coating was investigated by SEM, a water sorptivity test and an accelerated carbonation test. Successful self-healing was demonstrated for both scratch and crack damage in the coatings. Low-temperature self-healing was demonstrated with a saline solution sorptivity test conducted at −20 °C. The linseed-oil-based microcapsule-type self-healing coating system is a promising candidate as a protective coating for cementitious materials.

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“…Currently, there has been no research on self-healing coating for preservative-treated bamboo (and wood), although several studies on self-healing coating for steel or concrete have been reported [23,25,[31][32][33][34]. It is well known that the material properties of steel or concrete and bamboo are obviously different [35].…”

Section: Introductionmentioning

confidence: 99%

Self-healing coatings for inhibiting corrosion of ferrous metals exposed to preservative-treated bamboo

et al. 2020

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This study aims to provide an effective method of inhibiting the corrosion of ferrous metals exposed to preservativetreated bamboo, thereby prolonging material service life and reducing maintenance costs. The synthesis and characterization of microcapsules were first described. The characterization included the particle size, surface morphology, thermal stability, and core content of microcapsules. The results showed that microcapsules had good thermal stability and high core loading. Then, the self-healing performance and corrosion resistance of self-healing coatings were evaluated. The results indicated that self-healing coatings can identify and heal the damage automatically and had a more positive effect on inhibiting metal corrosion. Also, the mechanical properties of self-healing coatings were analyzed. The results demonstrated that microcapsule embedment did not almost affect the mechanical properties of self-healing coatings.

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Microcapsule-Type Self-Healing Protective Coating for Cementitious Composites with Secondary Crack Preventing Ability

Cited by 20 publications

References 14 publications

Low-Temperature Self-Healing of a Microcapsule-Type Protective Coating

Low-Temperature Self-Healing of a Microcapsule-Type Protective Coating

Self-Healing Coatings Based on Linseed-Oil-Loaded Microcapsules for Protection of Cementitious Materials

Self-healing coatings for inhibiting corrosion of ferrous metals exposed to preservative-treated bamboo

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