MATERIALS | HIGH PERFORMANCE COMPOUNDS
Tremin 283
Tremin 939
to be fully exploited. Toughness especially can be improved by using silanised fillers. HPF’s short-needled wollastonite Tremin 283
Trefil Kaolin TEC 110
Above: Electron micrograph images of four different HPF fillers showing morphological differences. From top Tremin 283 short needled wollas- tonite, Tremin 939 long needle wollastonite, Trefil phlogopite mica, and platelet-like Kaolin TEC 110
temperatures upwards of 300°C (310, 350, and 315°C respectively). HPF has considerable exper- tise in surface modification of fillers.
Surface treatments The surface treatment of the mineral filler ensures optimum compatibility at the interface between the polymer matrix and the filler system. Coated fillers are also easier to incorporate into a polymer than uncoated fillers. The optimal effect between the polymer and the high-performance filler is achieved by the use of a coating agent specially adapted to the polymer system. In most cases, this allows the system-improving properties of the filler
fine particles coated with aminosilane have been used successfully for many years as functional fillers for polyamides where freedom from deformation and high impact strength are required. Higher stiffness can be achieved with the Tremin 939 long-needled qualities. However, its morphology is said to lead to a certain degree of anisotropy. Phlogopite is a platelet-shaped mica mineral used as a reinforcing material in polyamide compounds. It has a brown colour, which means that it can only be used to a limited extent for light shades. Phlogopite in polyamide moulding compounds shows high stiffness, says HPF, which qualifies it for many applications, especially when the focus is on large, temperature-resistant plastic parts under the hood. Kaolins are layered silicates that are more-or-less
platelet-like depending on their mineralogical genesis. By selecting the right mineral raw material, and through the use of suitable processing, the company says fillers can be produced that enable particularly interesting properties. With its Kaolin TEC 110 grade, HPF says it has succeeded in devel- oping a highly platelet-shaped quality with good reinforcing properties at a very attractive price/ performance ratio. The full mechanical benefits of the needle- shaped wollastonite and platelet-shaped kaolin and mica products in the compound can only be exploited if the structure of wollastonite needles and also the kaolin and mica platelets are retained during processing. HPF says all production lines
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IMAGE: QUARZWERKE/HPF THE MINERAL ENGINEERS
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