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Zinc Dialkyldithiophosphate ZDDP Antioxidant And Corrosion Inhibitor Ideal Antioxidant
Jun 13, 2017

Zinc Dialkyldithiophosphate ZDDP Antioxidant And Corrosion Inhibitor Ideal antioxidant

Antioxidant is a class of chemicals that, when only a small amount of polymer in the system exists, can delay or inhibit the polymer oxidation process, thereby preventing the aging of the polymer and extend its service life, also known as " Antioxidant ".

For engineering plastics processing, antioxidants can prevent some polymers (such as ABS, etc.) in the process of thermal oxidation degradation, so that the molding process can be carried out smoothly. The amount of antioxidant added - only 0.1-0.5 copies.

The ideal antioxidant should have the following conditions:

① should have a high antioxidant capacity;

② compatibility with the resin is good, no precipitation;

③ good processing performance. In the polymer processing temperature is not volatile, not decomposition;

④ good resistance to extraction, insoluble in water and oil;

⑤ their own color is best for colorless or light color. To no pollution products;

⑥ non-toxic or low toxicity;

⑦ low price.

In fact, any kind of antioxidant can not fully meet these conditions, therefore, the actual use of engineering plastics in accordance with the type, use and processing methods, the use of various additives long, with the use of production synergies.

Name Introduction Edit

Broadly speaking, most of the weak reductants are antioxidants, but according to different industrial purposes to select the appropriate. Highly chemical, physical stability, or low toxicity of the weak reducing agent, can be cleverly used in the formula as an antioxidant. For example: citric acid is a weakly reducing organic acid, we can use it in the beverage formula plays the role of antioxidants; food placed a long time easy to oxidative deterioration, you can add a small amount of antioxidants to extend their storage Time; plastic, synthetic fiber and rubber and other polymer materials prone to thermal oxygen degradation reaction, adding antioxidant can maintain the excellent performance of polymer materials to extend the service life ... ...

The thermal oxidation process of organic compounds is a series of free radical chain reaction, in the heat, light or oxygen under the action of organic molecules of chemical bonds break, generate lively free radicals and hydroperoxides. Hydroperoxide undergoes decomposition reactions and also produces hydrocarbon radicals and hydroxyl radicals. These free radicals can trigger a series of free radical chain reactions, resulting in organic compounds and the nature of the fundamental changes in the structure. The role of antioxidants is to eliminate the free radicals, or to promote the decomposition of hydroperoxide, to prevent the chain reaction. Can eliminate free radical antioxidants are aromatic amines and hindered phenols and other compounds and their derivatives, known as the main antioxidant; can break down the antioxidant antioxidant phosphorus and phosphorus containing organic compounds, known as Auxiliary antioxidant.