Functional coatings via isocyanate-cured phenolics for anti-graffiti and via benzoxazines for high-temperature and high-pressure (HTHP) applications
•Allied chemistry, formulation of phenolic polyurethanes for anti-graffiti applications.•Applied formulation and validation of fusion bonded benzoxazines for downhole drill pipe interior linings, one real-world high temperature and high pressure (HTHP) application.•One-component functional coatings...
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| Published in: | Progress in organic coatings Vol. 151; p. 106094 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
| Published: |
Lausanne
Elsevier B.V
01-02-2021
Elsevier BV |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | •Allied chemistry, formulation of phenolic polyurethanes for anti-graffiti applications.•Applied formulation and validation of fusion bonded benzoxazines for downhole drill pipe interior linings, one real-world high temperature and high pressure (HTHP) application.•One-component functional coatings of isocyanate-cured benzoxazines and benzoxazine-bismaleimide copolymerization involving Diels―Alder ring-forming reactions.•Effective organometallic catalysts for coating technologies related to phenol hydroxyl functions of phenolics and benzoxazines.•Structure-property relationships in broad epoxy systems. Coating characterization techniques by DMA rheology and DSC kinetics.
In this work centering on phenolic chemistry, we investigated isocyanate and benzoxazine modified phenolic powder coatings aimed to better address a couple of industrial applications. In one aspect, allied polyurethane formulations were developed using phenolic hydroxyl-isocyanate reactions and shown to outperform conventional aliphatic polyol-isocyanate coatings for graffiti resistance. Variants like phenol hydroxyl equivalent weights and molecular weights of phenolic resins were examined. In another aspect intended for oil and gas downhole drill pipe interior linings, novel fusion bonded benzoxazine/ epoxy/ phenolic formulations, with or without an acid catalyst, exhibited excellent adhesion, toughness and process-ability, in addition to greatly reducing cure requirements versus benzoxazine self-polymerization. Applicable rheology and kinetics were quantified, revealing characteristic flow and cure behaviors facilitating formulation optimization. Moreover, coating modules of isocyanate-cured benzoxazines and benzoxazine-bismaleimide were proactively established via effective catalysts. |
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| ISSN: | 0300-9440 1873-331X |
| DOI: | 10.1016/j.porgcoat.2020.106094 |