ADDITIVES | ANTIOXIDANTS AND STABILISERS
A major benefit claimed for the new formula- tions is faster crosslinking reactions at ambient temperature, which can help increase compounder productivity. They are also said to provide “excel- lent” metal deactivation for compounds in contact with metal conductors, increasing cable longevity. Lowinox PE 807 and PE 808 are supplied as
Figure 4: Comparison of colour development of non-stabilised and stabilised chromium-catalysed HDPEs after multiple extrusion passes using two different Songwon additive systems Source: Songwon
dust-free pellets. The premixing of the additives results in a homogenous composition in the blend, increasing dosing accuracy and dispersion in the compounds. They can be used for the traditional production of catalyst masterbatches and subse- quently be diluted for use in the Sioplas process. In the Monosil process they can be used directly as supplied.
Weathering PA PA compounds often need UV absorbers and light stabilisers to improve weatherability. Conventional light stabilisers used in polyamide include UV-234 or UV-1577 types. However, Taiwan-headquartered Everlight Chemical, says as requirements for weather resistance increase these traditional light stabilisers may fall short. It has designed Eversorb PA3 specifically for polyamide. Figure 5 shows that under the 1,000h QUV weathering test (according to the ASTM G154 standard), the gloss value of PA containing UV-234- or UV-1577 is only 24% and 38% respectively of the original gloss value. The gloss value of PA containing EversorbPA3 remains virtually unchanged. Loss of gloss is usually the result of surface
Figure 5: Gloss values of PA resins using different stabilisation systems after 1,000h QUV accelerated testing exposure (ASTM G154) Source: Everlight
cracking. After 1,000h of QUV exposure, the control group showed significant surface cracking, with the gloss value decreased to 22. With the
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