MATERIALS | MINERAL FILLERS
Calcinated kaolin provides enhanced opacifying performance and can partly replace TiO2
company. “However, the contribution of calcium carbonate in terms of productivity and [granule] filler level should not be underestimated, as it is a unique opportunity to delay the need for major investment in both new machinery and modifica- tions of production processes.” Calcipore 80T AL was developed for this reason.
The company says it is specifically designed to offer maximum productivity and the highest level of filler in the masterbatch granule. One key benefit is the ability to greatly reduce levels of TiO2
in
white masterbatch. The company says it has demonstrated im-
Image: Kärntner Montanindustrie
creates a laminar structure that causes high opacity.” Schulz says while high opacity can be achieved with OmyaPET (Figure 1), when a 100% light barrier
is required, such as in UHT milk bottles, some TiO2 is needed. “In single-layer PET milk bottles, the use of 10% TiO2
70% of the TiO2
is common and Omya has shown that can be replaced by OmyaPET.”
The OmyaPET additive also reduces the amount
of energy needed to heat PET bottle preforms prior to blowing into bottles. This is because preforms are heated with IR heaters and TiO2
reflects a lot of
the radiation. This is not the case with OmyaPET. Omya says the OmyaPET products are being
introduced first in Europe with other regions to follow later.
Optimised for white Spanish CaCO3
product to complement TiO2
supplier Reverté is also offering a with the introduction
of a new grade for production of white master- batch. “The first thing that comes to mind when we want to maximise productivity and filler levels in producing [granules] is to adjust the process parameters (rpm of the spindle / rotor, temperature profile, spindle configuration, etc.),” says the
Right: This SEM image of aluminium silicate shows its high aspect ratio structure
proved productivity using twin-screw extruders and continuous mixers compared with other calcium carbonates of the same average particle size (D50 = 1.1 micron). “In continuous mixers — for example, Farrell CP 2500 — it has been found to eliminate undissolved particles, as shown by the low pressure values in the filter test,” the company says. Austria’s Kärntner Montanindustrie (KMI) specialises in delaminating and micronising minerals with special particle shapes. “Sophisti- cated grinding technology maintains the platelets and the needles even at finest particle sizes and provides products with high aspect ratio (HAR),” says Veronika Mayer, Application Management & Quality Management. The latest developments at the company are mainly connected with trends such as the circular economy and sustainability, she says. One example she highlights is the potential for its Miopac calcined kaolin to be used as an extender for TiO2
,
which she says has certain health and safety issues associated with it. Calcination of kaolin develops opacifying properties by removing hydroxy groups and building up aggregates of calcinated particles. “Complete substitution [of TiO2
] still seems to be
the Holy Grail, but at least partial replacement is possible,” she says. “Miopac provides excellent opacity and high whiteness.”
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Trinity Performance Materials is marketing its Altibright as a talc alternative
26 COMPOUNDING WORLD | June 2021
www.compoundingworld.com
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