Development of active modified kaolin as anticorrosive fillers | ||||
| Egyptian Journal of Chemistry | ||||
| Articles in Press, Accepted Manuscript, Available Online from 21 May 2025 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejchem.2025.376873.11623 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
Walaa W. Diab  1; Yasser K. Abdel-Monem2; Nabil Abdel Ghany 3; Ahmad M. Labeeb 4; Hassan Emira1; yosreya mostafa abu-ayana1
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| 1Polymers and Pigments Department, Chemical Industries Institute, National Research Centre, 33 Bohouth Street, Dokki, Giza, Egypt, PO Box 12622 | ||||
| 2Chemistry Department, Faculty of Science, Menoufia University, Shibin El Kom, Egypt | ||||
| 3Physical Chemistry Department, Electrochem. and Corrosion Lab, National Research Centre, 33 Bohouth Street, Dokki, Giza, Egypt, PO Box 12622 | ||||
| 4Microwave Physics and Dielectrics, Physics Research Division, National Research Centre (NRC), Giza, 12622, Egypt | ||||
| Abstract | ||||
| Intercalation of kaolin by urea molecules via mechanical grinding resulted in partial delamination with some broken bonds between kaolin layers. This permits subsequent modification by either active APTES (3-amino propyl triethoxy silane) or urea-formaldehyde polymer chains. Therefore, this study aims to develop new active fillers depends on modified kaolin and encapsulated modified kaolin which are considered as new encapsulated corrosion inhibitors. A type of these encapsulated active fillers, the intercalated kaolin by urea (UK) was silylated with APTES then coated by a shell of urea-formaldehyde polymer through in-situ polymerization method. Another type, UK was modified by urea-formaldehyde polymer and then coated by APTES layer. All the prepared fillers were characterized by FTIR, X-ray diffraction, thermal analysis, SEM and EDX measurements. Then, varnish formulations contain 10% of prepared fillers and alkyd resin were coated to mild steel surface to study their efficiency as anticorrosive fillers by electrochemical impedance spectroscopy (EIS). The results indicated that APTES was successfully grafted on to the surface of kaolin and in between its exfoliated layers and urea-formaldehyde polymer formed a continuous shell encapsulating the active silylated kaolin molecules. Additionally, the encapsulated filler UK-UF-AP has superior anticorrosive properties for steel protection. | ||||
| Keywords | ||||
| Kaolin; mechanochemical grinding; urea-formaldehyde; APTES grafting; EIS | ||||
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