高分子聚合物及其制品在使用或貯存過程中，由于受熱、光照、臭氧氧化、或金屬離子的催化作用，其表面逐漸發(fā)生變化，例如變色、發(fā)粘、變硬發(fā)脆、裂紋等；同時機械性能降低，伸長率等大幅度下降，透氣率增大，以致失去使用價值，這種現(xiàn)象稱為老化或熱氧老化。為了抑制或延緩上述變化的進程，延長它們的使用壽命，提高其使用價值，人們在高分子聚合物的制備過程中加入一些能延緩其老化的化合物，這類化合物就是抗氧劑。

During the use or storage of high molecular polymers and their products, the surface gradually changes due to heat, light, ozone oxidation, or metal ions, such as discoloration, stickiness,hardening and brittleness, cracks, etc. At the same time, the mechanical properties are lowered, the elongation rate is greatly reduced, and the air permeability is increased, so that the use value is lost. This phenomenon is called aging or thermal oxygen aging. In order to suppress or delay the progress of the above changes, prolong their service life and increase their use value, people add some compounds which can delay their aging during the preparation of high molecular polymers, and these compounds are antioxidants.

受阻酚是最有效的抗氧劑之一，其結(jié)構(gòu)中含有—OH官能團，比較容易給出氫原子，即通過質(zhì)子給予作用，從而破壞自由基自動氧化鏈反應(yīng)：

Hindered phenol is one of the most effective antioxidants, and its structure contains -OH functional groups, which are relatively easy to give hydrogen atoms, that is, destroying the free radical auto-oxidation chain reaction by proton donation:

Ar-OH + ROO·→ ROOH + Ar-O·

此過程生成的芳氧自由基比較穩(wěn)定，它兼具捕獲活性自由基的能力，進而還可以終止第二個動力學(xué)鏈：

Ar-O·+ ROO·→ROO-O-Ar(非自由基產(chǎn)物)。包括醌類在內(nèi)的中間產(chǎn)物，對防止高分子的熱氧老化也有重要意義。

The aromatic oxygen radical generated by this process is relatively stable, and it has the ability to capture active free radicals, and thus can terminate the second dynamic chain:

Ar-O·+ ROO·→ROO-O-Ar (non-free radical product). The intermediates, including quinones, are also important to prevent thermal oxygen aging of polymers.

OMNISTAB? AN565是一種高分子量的多功能受阻酚抗氧劑，主要適用于不飽和橡膠的后加工穩(wěn)定處理，能保護材料在生產(chǎn)，加工和最終使用過程中不發(fā)生熱氧化降解。OMNISTAB? AN565的添加量小，具有低揮發(fā)性，高色牢性，并能防止凝膠的形成。 

OMNISTAB? AN565 is a high molecular weight multifunctional hindered phenolic antioxidant. It is mainly suitable for post-processing and stable treatment of unsaturated rubber. It can protect them aterial from thermal oxidative degradation during production, processing and final use. OMNISTAB? AN565 has a small addition amount, low volatility, high color fastness, and it can prevent the formation of gel.

OMNISTAB? AN565在許多彈性體中使用均非常有效，比如： BR，IR，SBR，NBR，XSBR 以及SBS，SIS等。 同時 OMNISTAB? AN565 亦可用于黏合劑，天然及合成樹脂，如EPDM， ABS， PA， HIPS及聚烯烴類。

OMNISTAB? AN565 is very effective in many 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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