Use this URL to cite or link to this record in EThOS:
Title: Functional fillers for decorative paints
Author: Ruszala, Matthew James Amor
ISNI:       0000 0004 7426 1289
Awarding Body: University of Birmingham
Current Institution: University of Birmingham
Date of Award: 2018
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
A formulation process for CaCO3 spheres (D50 of 5.1 μm) for use as a functional filler in decorative paints was optimised. This increased the yield of CaCO3 spheres 20-fold and made the process less hazardous, with organic oils, namely rapeseed oil, being used successfully as a replacement for toluene. The CaCO3 spheres contained a multitude of < 250 nm nanovoids, with some spheres containing a core void > 800 nm. These pores formed because the crystals nucleated at the interface of emulsion droplets, resulting in CaCO3 spheres (2.42 g cm-3; 2,420 kg m-3) composed of calcite and vaterite, with a density lower than either mineral (2.71 g cm-3 (2,710 kg m-3) and 2.65 g cm-3 (2,650 kg m-3), respectively). The characterisation and performance of CaCO3 spheres in paint formulations were compared against commercially available products, namely Microdoll H600 (5 μm dolomite). There was no opacity benefit, however a 4-fold scrub resistance benefit was observed. Different oils can be used in the emulsification step in CaCO3 spheres production whilst others cannot, most likely because of the ratio of mono- to poly-unsaturated fatty acids. A technique for improving scrub resistance of other mineral extenders was developed, with AkzoNobel continuing the research into this area.
Supervisor: Not available Sponsor: Engineering and Physical Sciences Research Council (EPSRC) ; AkzoNobel
Qualification Name: Thesis (D.Eng.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TP Chemical technology