Inorganic coating composition containing functionalised graphene as a replacement for metallic pigments

A coating composition comprises inorganic binder, metallic pigment, filler, and functionalised graphene. Typically, the composition contains 5-50 wt.% inorganic binder, 5-90 wt.% metallic pigment, and 0.5-10 wt.% functionalised graphene. The binder may be alkyl silicate resin. The pigment may compri...

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Bibliographic Details
Main Authors Henegama Llyanage Mallika Bohm, Sivasambu Bohm, Karanveer S. Aneja
Format Patent
LanguageEnglish
Published 21.04.2021
Subjects
ADHESIVES
CHEMICAL PAINT OR INK REMOVERS
CHEMISTRY
COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS
CORRECTING FLUIDS
DYES
FILLING PASTES
INKS
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
PASTES OR SOLIDS FOR COLOURING OR PRINTING
POLISHES
USE OF MATERIALS THEREFOR
WOODSTAINS
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Summary:A coating composition comprises inorganic binder, metallic pigment, filler, and functionalised graphene. Typically, the composition contains 5-50 wt.% inorganic binder, 5-90 wt.% metallic pigment, and 0.5-10 wt.% functionalised graphene. The binder may be alkyl silicate resin. The pigment may comprise zinc, aluminium, magnesium or alloys thereof, iron oxide, or conductive metal oxide. The filler is preferably CaCO3, talc, mica, or TiO2. Use of functionalised graphene to replace metallic pigment in coating layers is claimed. A method of producing the coating composition is disclosed. The functionalised graphene may be formed by functionalising graphene with 0.1-10 wt.% chemical linker, e.g. organosilane. The graphene may be oxide-free, partially oxidised, or have <5% oxygen content. The method may comprise combining a solvent premix containing functionalised graphene, metallic pigment, and filler with the inorganic binder. The coating composition may coat metal substrates, automotive vehicles, aircraft, electrical appliances, offshore structures, marine vessels, or dry docks.
Bibliography:Application Number: GB20190009237