SURFACE MODIFICATION | SCRATCH AND WEAR
Migration/ blooming of Evonik’s Tegomer AntiScratch 100 OMS additive in a PP compound compared with current alternatives (VW PV 1306 test — UV irradiation 5 J/ m2
× 96 hours) Source: Evonik
combination of recycled and virgin materials,” he says. “Luxury cars, historically a very demanding environment, can increasingly utilise recycled material if properly modified, even in the most exposed applications such as interior door panels, for example.” Evonik says it offers organo-modifier siloxanes (OMS) in liquid and solid form that are designed to influence polymer surfaces without migration and bloom to the surface. Tegomer AntiScratch L, Tegomer AntiScratch 100 and Tegomer H-Si 6441 P are examples of additives that can provide long- term scratch resistance in polyolefins and engineer- ing resins, while also preventing migration. Due to the OMS chemistry, the additives also reduce friction and wear of polymer parts. For example, TPE-S materials now have applications as air bags or sealants for automotive window glass. Evonik surface modification additives allow manufacturers to reduce the coefficient of friction, while prevent- ing blooming for the lifetime of the materials, in a different way to other market solutions. As well as the control of haptics, this process can minimise the use of traditional waxes or oils that migrate over time. Tegomer H-Si 6444 P is Evonik’s latest develop- ment in this area. “This additive was designed to improve the scratch resistance of engineering resins such as PA, PC, PMMA and PBT, as well as TPEs and polyolefins,” says Offenbach. “It also lowers the coefficient of friction of materials such as TPUs or TPEs, can maintain transparency in polymers such as PMMA, improve the appearance of polymer surfaces with glass fibres such as PP/GF or PA/GF, and improve dispersion of fillers and pigments.
22 COMPOUNDING WORLD | February 2022
Specialty compounder RTP Company has
introduced a number of new Surface Protection Compounds, specifically formulated to improve the surface of plastic parts by resisting scratches, scuffs and mar. The company says that parts moulded using its Surface Protection compounds result in fewer quality rejections during manufacture, eliminate the need for costly protective coatings, and maintain good surface appearance throughout service life. Applications include consumer goods, electronics and automotive parts.
Long fibre gains Meanwhile, Avient has introduced a new series of polyamide-based Complēt long fibre reinforced thermoplastic compounds with enhanced moisture resistance and smooth surface aesthetics. These formulations feature PA6 and PA66 base resins with delayed moisture absorption, which prolongs the effectiveness of their structural performance in moisture-rich environments. The materials also address the inconsistent surface appearance issues with long fibre polyamides that have affected quality perceptions in the past. Long glass fibre reinforced grades of Complēt moisture-resistant PA feature surfaces that are smooth and virtually free of visible fibre, making them suitable for a wide range of consumer applications. The company says Complēt grades are globally available in several fibre loading levels (weight percentages) using long glass fibre, long carbon fibre, or hybrid combinations. This allows the materials to retain structural properties that fall between those of standard and speciality PAs when exposed to moisture. As a result, the materials are ideal for metal replacement and lightweighting initiatives in automotive and powersports applica- tions that encounter varying climates or intermit- tent exposure to water. “When manufacturers wanted to quell perfor- mance concerns by limiting moisture absorption for nylon 6 or 66, the only options were less hygroscopic and more costly speciality nylons,” says Eric Wollan, General Manager of Avient’s long fibre technologies. “Avient’s new line of moisture- resistant nylon LFTs are modified to absorb moisture more slowly. This significantly prolongs the effectiveness of a part’s structural capabilities in humid environments or during short-term water immersion, but at a more economical price point.” Additionally, Complēt PA grades provide lower shrink for applications that require high dimension- al stability. In effect, they serve as a material solution to combat warp distortion from uneven cooling. EMS-Grivory has developed Grivory G7V for a
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