ADDITIVES | SURFACE MODIFICATION
transforming it into an easy-to-process, solid product form,” Geck says. Genioplast Pellet S comes as small cylindrical pellets containing 70% silicone in a pyrogenic silica carrier. Geck says the carrier contributes significant- ly to the additive’s favourable properties. “First, the pyrogenic silica is responsible for the firm consist- ency of the additive. Second, it is compatible with all thermoplastics. Third, it anchors the active ingredient in the polymer matrix,” he explains.
Above: Scratch testing of a plastic sample being carried out at Wacker
vehicle’s entire service life. It improves scratch and abrasion resistance by reducing surface friction so objects slide over the surface more easily, leaving fewer visible marks, he explains. Conventional additives can have a number of less desirable effects, according to Wacker. Organic antifriction agents, for example, can present an unpleasant odour and, when they migrate over time, can cause (among other things) windscreen fogging. The surface feel of the part can also change in a negative way. Silicone fluids are odourless and can easily withstand high tempera- tures, but tend to migrate even more than organic grades. Ultra-high molecular weight silicone polymers do not migrate but are so highly viscous it is difficult to incorporate them into compounds (silicone masterbatches can solve this handling problem but the compounder then needs to keep a specific additive masterbatch in stock for each thermoplastic they need to modify). Wacker’s goal in developing Genioplast Pellet S
was to create a highly effective and easy-to-process silicone additive that would be universally suitable for all thermoplastics. “There was no doubt that the active ingredient would be an ultra-high-molecular silicone. What proved to be difficult, however, was
Simulated benefits Wacker carried out tests to simulate scratching with a sharp-edged ignition key. Viewed under a microscope, it is clear that the scratches are less deep and rough in the plastic samples that have been modified with Genioplast Pellet S. This benefit is maintained even when the test panels had been stored at 80 °C for a week. The reduction in scratch depth and roughness means the parts with the additive scatter incident light less strongly and so appear less bright. This has been confirmed by brightness measurement – an alternative testing method – which showed that scratched areas were less bright than the intact areas, making the scratches less noticeable. Tests show that Genioplast Pellet S reduces the
plastic’s surface friction, improving the scratch and abrasion resistance and incidentally also enhancing tensile strength and stiffness. Evonik has several antiscratch additives in its
Tegomer range. Tegomer Antiscratch 100 is said to significantly increase the scratch resistance of PP-based talc-filled compounds. Like Genioplast Pellet S, Tegomer Antiscratch 100 is said to guarantee a durable result with no fogging or odou, as it is anchored to the polymer matrix. The solid Tegomer H-Si 6441P polyester-modified siloxane and liquid Tegomer M-Si 2650 aryl-modi- fied siloxane are aimed more at engineering plastics such as acrylic, polycarbonate and polyam-
Conductive Plastics 2018
Developing technologies and applications for electrically and thermally conductive plastics
www.ami.international https://www.linkedin.com/company/925294/ ami.international https://www.facebook.com/AMI.Events.Research/ https://www.ami.international/events/event?Code=C892#8993
CALL FOR PAPERS Click here for details
Our second North American Conductive Plastics 2018 conference takes place on March 20-21 at the Pittsburgh Marriott City Center, in Pittsburgh, PA, USA.
You will explore the design and manufacturing of electrically and/or thermally conductive plastic components and examine the latest additive technologies and compounding techniques at this high level two-day conference. To register as an exhibitor or delegate and to get more information on sponsorship packages, please contact the Coordinator Christina Winegarden on Tel: +1 610 478 0800 Email:
christina.winegarden@
ami.international
Media supporters:
https://twitter.com/Contact_AMI
@Contact_AMI #AMICPUS
PHOTO: WACKER
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84 |
Page 85 |
Page 86 |
Page 87 |
Page 88
