technology | PA Additives
between 80 and 85s. And even with the lower process- ing temperature, they can still get good flow and very good surface quality.” She says there is no compromise on other key properties such as dimensional stability. Furthermore, the additive removes the need for any additional demoulding agent (Figure 4).
Figure 3: Bruggolen TP-P1507 is designed to improve flow in PA compounds, particularly grades with high levels of glass fibre reinforcement. The images show how the length of a flow spiral with a 50 % glass fibre-reinforced polyamide 6 can be increased by more than half. Source: Brüggemann
as air intake manifolds and engine covers. It also acts as a radical scavenger to reduce oxidation. In addition, AddWorks LXR 701 is said to enable a reduction in cycle times by allowing processing temperatures—and hence cooling times—to be reduced. Temperatures at the nozzle of the injection moulding machine can be reduced by around 10%, she says. Tests in production of a 500g air ducts show that it is possible to reduce cycle time by between 10 and 15%, sometimes more. “We had a case with an injection moulding company
that could not get cycle time below 97s for a large part,” Meddah says. “Now, using LXR 701, they are running at
Improved stability Clariant is readying another new additive for full commercialisation early in the second half of this year. AddWorks TFB 117 can be used during both polymeri- sation and compounding of various polyamides, including PA6, 66, 11 and 12 and copolymers. Feedback from its use in customer pilot and production plants indicates that AddWorks TFB 117 improves initial white colour and thermal stability in processes such as fibre spinning as well as injection moulding. Mohamed Sidqi, Business Development Manager for Engineering Plastics Additives, says there is less filament breakage during spinning at high speeds and the fibres display better elongation and tensile strength. Fibre dyeing and mass coloration for glass filled polyamides are also improved, he says. AddWorks TFB 117 is described as a synergistic
combination of a hindered amine light stabiliser (HALS) and a phosphorus-containing component. Sidqi says trials to date have been very successful, noting that when used in polycondensation reaction applications the reaction time can be shortened by up to 20-25%. In compounding, some customers have been trialling AddWorks TFB 117 with high temperature polyamides in order to reduce processing temperatures from close to 310°C to below 300°C. “One customer was able to reduce the temperature from 305 down to 295°C and
Figure 4: AddWorks LXR 701 can deliver a noticeable reduction in moulding cycle times, particularly with complex parts. This data is taken from production of a 780g automotive part injection moulded in 35% glass reinforced PA66 Source: Clariant
26 COMPOUNDING WORLD | February 2017
Figure 5: Colour (YI) of PA6 granules improves with use of Clariant’s soon-to-be commercialised AddWorks TFB 117 additive Source: Clariant
www.compoundingworld.com
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