Influence of synthetic and bio-based amine curing agents on properties of solventless epoxy varnishes and coatings with carbon nanofillers

[Display omitted] •Successful raw carbon nanofiller (CN) dispersion in an epoxy hardener (bio-based PAA).•Improved antistatic/optical features and cupping resistance of coatings with PAA/CN.•Proecological solutions: solventless coating system and use of bio-based hardener. Solventless epoxy varnishe...

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Veröffentlicht in:Progress in organic coatings 2017-08, Vol.109, p.83-91
Hauptverfasser: Kugler, Szymon, Kowalczyk, Krzysztof, Spychaj, Tadeusz
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Sprache:eng
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Zusammenfassung:[Display omitted] •Successful raw carbon nanofiller (CN) dispersion in an epoxy hardener (bio-based PAA).•Improved antistatic/optical features and cupping resistance of coatings with PAA/CN.•Proecological solutions: solventless coating system and use of bio-based hardener. Solventless epoxy varnishes and coatings were prepared using carbon nanotubes (CNT) and/or graphene (GNP) dispersions in a Bisphenol F-type epoxy resin, synthetic hardeners [tetraethylenepentamine, poly(oxyethylene)diamine, isophoronediamine, m-xylylenediamine] or bio-based amine hardener (Cardanol-based phenalkamine, abbreviationabbreviation: PAA). Room temperature cured coatings, containing 0.35wt.% of CNT predispersed in PAA, showed outstanding combination of optical (i.e. high gloss and transparency, low haze in humid conditions) and electrostatic dissipative properties (surface resistivity ca. 5.5×107Ω) in relation to the samples containing carbon nanofiller(s) dispersion in the epoxy resin or a synthetic amine. PAA-based coatings with the carbon nanofillers exhibited increased cupping resistance (+20% for samples with CNT) as well as high hardness and excellent adhesion to a glass substrate. The carbon nanofillers addition influenced on curing process and glass transition temperature (monitored using differential scanning calorimetry technique) of the epoxy varnishes and coatings as well.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2017.04.033