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首页> 外文会议>European Conference on Additives amp; Colors; 20070314-15; Mondorf-les-Bains(LX) >THE EFFECT OF METAL STEARATES ON THE THERMAL AND UV STABILITY OF POLYETHYLENE
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THE EFFECT OF METAL STEARATES ON THE THERMAL AND UV STABILITY OF POLYETHYLENE

机译：金属硬脂酸酯对聚乙烯的热稳定性和紫外线稳定性的影响

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摘要

Metal stearates (MSt) are commonly used as acid scavengers, color stabilizers and processing aids in polyolefins. The interaction of MSt with antioxidants (AO) based on phenolic (PN) and phosphite (PS) and UV stabilizers (UVS) based on hindered amine light stabilizer (HALS), was studied following three passes of extrusion, thermal and photochemical aging. Both low density polyethylene (LDPE) and high density polyethylene (HDPE) were included in the study. The MSt used in the study was zinc stearate (ZnSt). Following 3 extrusion passes the melt flow index (MFI) and oxygen induction time (OIT) were evaluated. In the case of thermal and UV aging the mechanical, carbonyl index (CI) and yellowness index (YI) were measured. Experimental results indicated that LDPE and HDPE interact differently with ZnSt, AO and HALS. Following extrusion, PN AO and ZnSt have a positive effect on the MFI of HDPE and a smaller effect in the case of LDPE. The PS AO is detrimental to HDPE when combined with ZnSt and show synergistic effects with LDPE. When the ratio between the PN and PS AO was 2 to 1, respectively, the effects were positive. Upon thermal aging, LDPE and HDPE compounded with PN AO and ZnSt showed relative stability in terms of developing CI, while PS AO and ZnSt addition resulted in a detrimental effect on HDPE. The thermal aging effects onthe YI demonstrated the same trend as found in the CI measurements. In the case of UV aging, addition of 1000 ppm of HALS was found to give sufficient protection to both polyethylene resins, as indicated by the CI as well as YI measurements.
机译：金属硬脂酸酯（MSt）通常用作聚烯烃中的除酸剂，颜色稳定剂和加工助剂。在挤压，热老化和光化学老化三遍之后，研究了MSt与基于酚（PN）和亚磷酸酯（PS）的抗氧化剂（AO）和基于受阻胺光稳定剂（HALS）的UV稳定剂（UVS）的相互作用。低密度聚乙烯（LDPE）和高密度聚乙烯（HDPE）均包括在研究中。该研究中使用的MSt是硬脂酸锌（ZnSt）。在3次挤出通过之后，评估熔体流动指数（MFI）和氧诱导时间（OIT）。在热和紫外线老化的情况下，机械，羰基指数（CI）和黄度指数（YI）均被测量。实验结果表明，LDPE和HDPE与ZnSt，AO和HALS的相互作用不同。挤出后，PN AO和ZnSt对HDPE的MFI有积极影响，而对于LDPE则影响较小。 PS AO与ZnSt结合时对HDPE有害，并显示出与LDPE的协同作用。当PN和PS AO的比例分别为2∶1时，效果是积极的。热老化后，LDPE和HDPE以及PN AO和ZnSt的配混物在形成CI方面表现出相对的稳定性，而PS AO和ZnSt的添加则对HDPE产生不利影响。热老化对YI的影响表现出与CI测量相同的趋势。在紫外线老化的情况下，发现添加1000 ppm的HALS可以为两种聚乙烯树脂提供足够的保护，如CI和YI测量值所示。

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