高分子聚合物及其制品在使用或贮存过程中，由于受热、光照、臭氧氧化、或金属离子的催化作用，其表面逐渐发生变化，例如变色、发粘、变硬发脆、裂纹等；同时机械性能降低，伸长率等大幅度下降，透气率增大，以致失去使用价值，这种现象称为老化或热氧老化。为了抑制或延缓上述变化的进程，延长它们的使用寿命，提高其使用价值，人们在高分子聚合物的制备过程中加入一些能延缓其老化的化合物，这类化合物就是抗氧剂。
During the use or storage of highmolecular polymers and their products, the surface gradually changes due toheat, light, ozone oxidation, or metal ions, such as discoloration, stickiness,hardening and brittleness, cracks, etc. At the same time, the mechanicalproperties are lowered, the elongation rate is greatly reduced, and the airpermeability is increased, so that the use value is lost. This phenomenon iscalled aging or thermal oxygen aging. In order to suppress or delay theprogress of the above changes, prolong their service life and increase theiruse value, people add some compounds which can delay their aging during thepreparation of high molecular polymers, and such compounds are antioxidants.
受阻酚是最有效的抗氧剂之一，其结构中含有—OH官能团，比较容易给出氢原子，即通过质子给予作用，从而破坏自由基自动氧化链反应：
Hindered phenol is one of the mosteffective antioxidants, and its structure contains -OH functional groups, whichare relatively easy to give hydrogen atoms, that is, destroying the freeradical auto-oxidation chain reaction by proton donation:
Ar-OH + ROO·→ ROOH + Ar-O·
此过程生成的芳氧自由基比较稳定，它兼具捕获活性自由基的能力，进而还可以终止第二个动力学链：
Ar-O·+ ROO·→ROO-O-Ar(非自由基产物)。包括醌类在内的中间产物，对防止高分子的热氧老化也有重要意义。
The aromatic oxygen radical generatedby this process is relatively stable, and it has the ability to capture activefree radicals, and thus can terminate the second dynamic chain:
Ar-O·+ ROO·→ROO-O-Ar (non-free radicalproduct). The intermediates, including quinones, are also important to preventthermal oxygen aging of polymers.
OMNISTAB® AN565是一种高分子量的多功能受阻酚抗氧剂，主要适用于不饱和橡胶的后加工稳定处理，能保护材料在生产，加工和最终使用过程中不发生热氧化降解。OMNISTAB® AN565的添加量小，具有低挥发性，高色牢性，并能防止凝胶的形成。
OMNISTAB® AN565 is a high molecularweight multifunctional hindered phenolic antioxidant. It is mainly suitable forpost-processing and stable treatment of unsaturated rubber. It can protect thematerial from thermal oxidative degradation during production, processing andfinal use. OMNISTAB® AN565 has a small addition amount, low volatility, highcolor fastness, and it can prevent the formation of gel.
OMNISTAB® AN565在许多弹性体中使用均非常有效，比如： BR，IR，SBR，NBR，XSBR 以及SBS，SIS等。 同时 OMNISTAB® AN565 亦可用于黏合剂，天然及合成树脂，如EPDM， ABS， PA， HIPS及聚烯烃类。
OMNISTAB® AN565 is very effective inmany elastomers such as BR, IR, SBR, NBR, XSBR and SBS, SIS. OMNISTAB® AN565can also be used in adhesives, natural and synthetic resins such as EPDM, ABS,PA, HIPS and polyolefins.
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