The search for white fillers that can replace and compete with titanium dioxide have favoured the amorphous aluminium silicates
. Aluminium and sodium silicate is a white-coloured amorphous solid, obtained by the reaction of chemical precipitation between a sodium silicate and an aluminium salt in aqueous medium. It is a filler with many different applications, and it is used as a raw material in sectors such as the manufacture of paints, printing inks, the rubber or the paper sector.
Products SODASIL® P95
is the trade name of the amorphous sodium and aluminium silicate
marketed by IQE in the paint sector. It is used as a white pigment in paints, printing inks and paper, where it acts as a partial substitute for titanium dioxide (extender) at the same time as it increases the covering power and brightness both of the paint and of the paper. EBROSIL® SA-60
is the amorphous sodium and aluminium silicate
manufactured by IQESIL and which is used as a white filler in rubber, with a moderate reinforcing nature. Its application is especially indicated in the preparation of technical rubber pieces via an extrusion or injection moulding process.
Both the natural and synthetic rubber blends, which contain EBROSIL® SA-60
present good processability, even with higher filler levels than the reinforcing silica, as well as good vulcanisation properties. Their slightly alkaline nature permits their use in basic blends. +
The precipitated aluminium silicate
manufactured by IQE is a finely divided white-coloured powder. Its primary particle size is between 25 and 100 millimicrons (mµm), making it especially ideal for use as a white pigment in numerous applications. These primary particles are attached to each other to form cluster-like structures, which later join together to form what are normally called secondary particles, whose size can be defined by grinding and classification processes (generally between 5 and 10 µm). SODASIL® P95
is added as a filler in printing inks to increase the tixotropy of the ink and to increase the definition of the printed line. SODASIL® P95
can be used as a white pigment to partially replace TiO2
used in coated paper (wallpaper). It is also used as a white filler for papers than contain a large proportion of wood fibres (mechanical type) and newsprint. SODASIL® P95
confers on this paper the properties of reducing the blurring of printing inks, increasing the smoothness of the paper without increasing gloss, and increasing the brightness of the paper. SODASIL® P95
in paints and coatings partially replaces titanium dioxide, offering advantages such as:
- the improvement of the optical properties: higher degree of brightness and opacity,
- cost saving in the paint,
- an improvement of the rheological behaviour of the paint thanks to its greater stability during storage, on regulating the pH, maintaining a constant viscosity and acting as an anti-sedimenting agent, and
- an improvement of the properties of the paint applied on conferring greater resistance to wash and friction and less tendency to fouling.