ADDITIVES | IMPACT MODIFIERS
are lighter than traditional wood or concrete and offer better insulation and noise reduction.” Vermogen says the company’s emulsion based acrylic technology leads to good compatibility and stability with a broad variety of polymer matrices and additives, allowing for higher filler loadings. This, in turn, can lower the cost and environmental impact of formulations, he says.
Figure 1: Charpy impact modification of PBT or PET at -30 and 23° with 15% addition of Lotader AX8900 from SK Functional Polymer Source: SK Functional Polymer
content and/or high fluidity, with Lotryl 40MA05T the latest to be commercialised. Its high acrylate content contributes to its high flexibility and the company says it has already shown some success in improving the properties of several styrenic resins. Orevac IM800 is a highly reactive impact modifier designed for high impact resistance PA grades. It has been tested in several polyamides, including PA6, PA66, and long chain PA polymers, and is said to provide ‘exceptional’ impact perfor- mance at temperatures as low as -40°C. The company says that the modifier’s adjusted high reactivity and finely tuned viscosity helps maintain controlled viscosity of the compound. Impact modifiers remain a part of the Arkema
product portfolio and include BioStrength impact modifers for PLA and other bioplastics, Clear- Strength methylmethacrylate-butadiene-styrene (MBS) core-shell impact modifiers for engineering plastics such as PC, PC/ABS, PC/PBT and PC/PET as well as PVC and epoxy and ester-based thermo- sets, and DuraStrength acrylic impact modifiers for PC, PC/ABS, PC/PBT, PC/PET and PVC. According to Alexandre Vermogen, Arkema’s Global Market Manager for Plastic Additives, The company’s products are used across a wide range of industries, including construction, flooring, transportation, packaging, and E&E where they address challenges such as brittleness, cracking, fading, thermal shock, and UV exposure. “Notably, these impact modifiers enhance the toughness, durability, and appearance of plastics and composites, extending their service life and reducing the need for replacement and mainte- nance,” he says. “Additionally, they help create lighter and stronger materials that can reduce greenhouse gas emissions and fuel consumption. For example, they can improve the performance and aesthetics of foam decking and flooring, which
44 COMPOUNDING WORLD | April 2024
Toughening up Research carried out by Chinese functional additive supplier Fine Blend shows that its latest toughen- ing compatibiliser can provide significant benefits in production of blends of PC and PBT. Simple melt blending results in separation the crystalline and non-crystalline polymers, leading to poor adhesion at the phase interface and contributing to poor impact performance. Toughening compatiblisers such as ethylene- methyl acrylate-glycidyl methacrylate terpolymer (EMA-co-GMA), ethylene-butyl acrylate-glycidyl methacrylate terpolymer (EBA-co-GMA), and methyl methacrylate-butadiene-styrene terpolymer (MBS) with core-shell structure have all proved effective in PC/PBT blends. However, the company claims better results for a new POE-g-GMA product (SOG-03). The company says that the brittle-ductile
transition in a PC/PBT alloy began to occur at an addition of 3wt% SOG-03, which it says dispersed in the PBT phase while exhibiting a typical rubber toughened polymer morphology. Compared with EMA-co-GMA and SOG-03, MBS showed lower toughening efficiency and more obvious property degradation after multiple extrusion cycles. PC/PBT alloys containing MBS also showed lower impact properties than an equivalent with EMA-co-GMA or SOG-03 after long-term thermal oxygen ageing.
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Figure 2: Chart showing the effect of increasing addition of Fine Blend’s SOG-3 modifier on notched impact strength Source: Fine Blend
www.compoundingworld.com
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