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technology | PA Additives


of aging at 120°C. At twice the dosage, the time rises to over 4,000h (Figure 2). “In comparison, when 0.5 % of a conventional phenol/phosphite blend is used, the half-life of the elongation at break barely reaches 1,000h. Even if the concentration is doubled, the time is only 1,300 h,” he claims. Brüggemann Chemical has also added several other


new products for compounding polyamides to its portfolio, all of which are said to have a marked positive effect on processability. These include the Bruggolen TP-P1507 flow enhancer for reinforced polyamides, Bruggolen TP-P1401 nucleating agent for high process- ing temperatures, and Bruggolen TP-M1417 for recycling of high-viscosity polyamide scrap into high-grade injection-moulded material. Bruggolen TP-P1507 is intended to give independent


Figure 1: Bruggolen TP-H1606 heat stabiliser considerably extends long-term service life of PA66 compared with conventional phenol/ phosphite-based blends (dosage level 0.5%) Source: Brüggemann


compounders access to technology that normally is used only by polymer makers selling formulated products, according to Bergmann. The additive im- proves flow without having a negative effect on mechan- ical properties such as impact strength, elastic modulus, tensile strength and elongation at break (Figure 3). The additive is said to work slightly better in PA6 than in PA66. Bruggolen TP-P1401, meanwhile, can provide reductions in cycle times of up to 60%, while also providing improved surface gloss.


Figure 2: Bar chart showing the exposure time required for elongation at break in different PA66 compounds to reach half of the original value under ageing at 120°C Source: Brüggemann


Recording success At Clariant, Emilie Meddah, Technical Marketing Manager Additives for Global Automotive, says that following the introduction of AddWorks LXR 701 at the beginning of 2016 (see Compounding World Feb 2016), the company is now seeing some real successes with compounders and injection moulders. AddWorks LXR 701 was developed as a multi-func- tional additive for use in glass-reinforced polyamide injection moulding compounds. It improves flow and also surface quality—something that Meddah says is particularly noticeable in large and complex parts, such


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