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Anti-rust primer for steel based on natural rubber bearing methacrylic functionality
- Source :
- eXPRESS Polymer Letters, Vol 16, Iss 6, Pp 573-590 (2022)
- Publication Year :
- 2022
- Publisher :
- Budapest University of Technology, 2022.
-
Abstract
- This study aimed to develop an anti-corrosion primer for steel based on natural rubber (NR). Graft copolymers of NR and poly(methacrylic acid), NR-g-PMAA, were first synthesized using a solution polymerization technique. The degree of grafting of poly(methacrylic acid) in NR-g-PMAA was evaluated by the 1H-NMR technique. The primer was then prepared by compounding the synthesized NR-g-PMAA with colour pigment and isocyanate crosslinking agent (poly-HDI). The X-ray photoelectron spectroscopy analysis indicated the formation of amide and anhydride linkages in the NR-g-PMAA primer by reaction with poly-HDI under ambient conditions. The cross-cut and salt-spray tests suggested that good adhesion of the primer to the steel was achieved by adding a 2:1 molar ratio of poly-HDI:MAA. The addition of poly-HDI to the NR-g-PMAA primer also significantly improved its weathering resistance. No rust deposits formed on the steel coated with the cured primer after 500 h of exposure in a QUV Accelerated Weathering tester. In contrast, a layer of iron oxide formed over the steel coated with the uncured primer, indicating that it corroded during testing. The X-ray diffraction analyses revealed that the iron oxides formed under the experimental conditions were dominantly lepidocrocite and goethite. Hence, it can be stated that when the NR-g-PMAA primer is formulated in conjunction with an appropriate amount of poly-HDI, it offers the potential to develop an anti-rust primer for steel.
Details
- Language :
- English
- ISSN :
- 1788618X
- Volume :
- 16
- Issue :
- 6
- Database :
- Directory of Open Access Journals
- Journal :
- eXPRESS Polymer Letters
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f120028e3348491baf7a533bdbbeaac4
- Document Type :
- article
- Full Text :
- https://doi.org/10.3144/expresspolymlett.2022.43