This study progresses our earlier studies and takes the performance characteristics of a 1:1 Irganox 1010: Irgafos 168 combination at 1000 ppm each through multiple extrusion processes in a metallocene LLDPE (mLLDPE) investigating for the first time the role of a broad range of calcium and zinc stearates based on animal vs vegetable origins of the stearine function. In this case performance was assessed using Melt Flow Rate (MFR) coupled with HPLC to determine not only the additive depletions after processing but also the rate of production of the phosphite to phosphonate. Comparative control studies were also undertaken on the single use of the separate antioxidants. Both stearates influenced the activity of the antioxidants in particular their consumption. A greater consumption after the third and fifth extrusion was observed with metal stearates produced from the vegetable stearine. Moreover, zinc stearates seemed to provide a greater detrimental effect than calcium stearates. Hydroperoxide analysis on the stearates confirmed the animal stearine to contain higher levels of peroxides which may contribute toward the higher activity. The optimisation of the thermal stabilisation of the metallocene polyethylene (mLLDPE) has also been investigated in this study. Several conditions of stability were determined for the determination of the optimal antioxidant (phenol:phosphite) ratio. The main parameter was high melt stability for a maximum processing stability of the final package via DSC analysis (OIT) coupled with assessments of embrittlement time (oven ageing) and yellowness index. Long-term stability against thermo-oxidation was considered coupled with a consideration of their hydrolytic stability as a complicating factor. In this work the (phenol/phosphite) antioxidant formulations with two different phenolic antioxidants (Irganox 1010, Irganox 1076) and six different phosphite antioxidants (Irgafos 168, Irgafos P-EPQ, Adekastab PEP-8, Adekastab PEP-36, Adekastab PEP-24G, Adekastab HP-10) were assessed at different levels taking into account the various criteria for optimal performance providing hitherto useful information than many prior studies on 1:1% ratios i.e. how much phosphite is required for optimal activity. A question often posed in the field with the results concluding an interesting unified optimum ratio of 4:1 (for most antioxidants studied) taking into account all the critical parameters.

这项研究进行了我们的早期研究，并采用了茂金属LLDPE（mLLDPE）中的多种挤出工艺，以1000 ppm的比例分别采用1：1 Irganox 1010：Irgafos 168组合的性能特征，首次研究了广泛的钙的作用和硬脂酸锌基于动物与植物的硬脂酸功能起源。在这种情况下，使用熔体流动速率（MFR）结合HPLC评估性能，不仅可以确定加工后的添加剂消耗量，还可以确定亚磷酸盐生成膦酸酯的速率。还对单独使用单独的抗氧化剂进行了比较对照研究。两种硬脂酸酯都影响抗氧化剂的活性，特别是其消耗量。从植物硬脂精生产的金属硬脂酸酯在第三次和第五次挤出后观察到更大的消耗。此外，硬脂酸锌似乎比硬脂酸钙具有更大的有害作用。对硬脂酸盐的氢过氧化物分析证实动物硬脂酸含有较高水平的过氧化物，其可能有助于较高的活性。在这项研究中，还研究了茂金属聚乙烯（mLLDPE）的热稳定性的优化。确定了几种稳定性条件，以确定最佳的抗氧化剂（苯酚：亚磷酸酯）比例。主要参数是高熔体稳定性，可通过DSC分析（OIT）获得最终包装的最大加工稳定性，并评估脆化时间（烤箱老化）和泛黄指数。考虑到对热氧化的长期稳定性以及将其水解稳定性作为复杂因素的考虑。在这项工作中，（酚/亚磷酸酯）抗氧化剂配方包含两种不同的酚类抗氧化剂（Irganox 1010，Irganox 1076）和六种不同的亚磷酸酯抗氧化剂（Irgafos 168，Irgafos P-EPQ，Adekastab PEP-8，Adekastab PEP-36，Adekastab PEP- （24G，Adekastab HP-10）在不同水平上进行了评估，并考虑到了各种最佳性能标准，与许多以前关于1：1％比例的研究（即最佳活性需要多少亚磷酸酯）相比，迄今为止提供了有用的信息。考虑到所有关键参数，该领域经常提出一个问题，其结果得出令人感兴趣的统一最佳比例（对于研究的大多数抗氧化剂）为4：1（对于大多数抗氧化剂而言）。