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Recovery of titanium dioxide and other pigments from waste paint by pyrolysis

Karlsson Mikael Carl Fredrik (Institutionen för kemi och kemiteknik, Industriell materialåtervinning) ; Daniel Corr ; Christer Forsgren ; Britt-Marie Steenari (Institutionen för kemi och kemiteknik, Industriell materialåtervinning)
Journal of Coatings Technology Research (1547-0091). Vol. 12 (2015), 6, p. 1111-1122.
[Artikel, refereegranskad vetenskaplig]

In this work, a model paint containing several types of inorganic pigments was pyrolyzed in a microwave-heated unit. The goal of the pyrolysis process was to recover and recycle the inorganic components in the paint, most importantly titanium dioxide (TiO2). The solid residue remaining after pyrolysis was further heat treated in air to remove most of the char in the TiO2-containing product. The recovered TiO2-containing product was used in two types of paint formulation as a replacement for virgin pigments. The properties of the paints containing recycled TiO2 pigment and extenders were evaluated and compared with a standard paint formulation containing only virgin TiO2 pigment and virgin extenders. A reduction in paint whiteness was observed but the opacity, gloss, and durability were nearly equivalent to that of the standard paint. Another consequence of using recycled pigments was that the recycled mix of TiO2 pigments and extenders was harder to disperse in the paint than the mix based on virgin materials, thus giving the painted surface a somewhat rough texture. The recycled material has shown promising results as a pigment/extender but further work is needed to optimize the recycled product to meet whiteness and dispersion requirements for incorporation in paint formulations on an industrial scale.

Nyckelord: Extender, Paint waste recycling, Pigment, Pyrolysis, TiO2, Titanium dioxide recycling



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Denna post skapades 2015-12-29. Senast ändrad 2016-03-10.
CPL Pubid: 229214

 

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Institutioner (Chalmers)

Institutionen för kemi och kemiteknik, Industriell materialåtervinning

Ämnesområden

Materialvetenskap
Materialkemi

Chalmers infrastruktur