Antioxidants of plastic raw materials

Plastic as an important material in everyday life and its areas of application have been broadened. However, whether natural or synthetic polymer materials, they are easy occurred oxidation reaction and make the materials fading, yellowing, hardness, cracks, loss of gloss or transparent, etc, then it leads to significantly reducing of physical properties such as anti-impact strength, resistance around bending strength, tensile strength and elongation rate. These effect the normal using of plastic products.

Currently, the suitable measures to slow the oxidation of polymers are improvement of polymer chemical structure and add antioxidants. Among them, adding antioxidant is the most simple and general method to polymer stabilized treatment.
Antioxidants are the degradation additives that inhibit or delay the polymer by atmospheric oxygen or ozone. It is the most widely used plastic additives.

Plastic additives according to their chemical structure can be classified as amines, phenol, sulphur-containing compounds, phosphorus-containing compounds, organic metal salts, and so on. Amine additives are mainly used for the rubber industry, and the production of phenylenediamine and Keto amine are maximum; phenolic antioxidants are mainly hindered phenolic, which grow faster than amine antioxidant. It's mainly used in rubber and light plastic. Phenolic antioxidant and amine antioxidant are primary antioxidant, while sulfur and phosphite esters antioxidants belonging to secondary antioxidants, it can generate synergies if use with phenolic antioxidants, and it mainly used for polyolefin.

Take two antioxidants from OKCHEM as an example - antioxidant 1010 and antioxidant 1076.

Classification of antioxidants, one is the major antioxidant: capture the peroxide radicals, mainly is hindered phenolic antioxidant; primary anti-space hindered phenolic, 1010,1076 belong to this class. By capturing the free radicals produced during the plastic-degrading then long-term sustainability play its anti oxidation role.




One is secondary antioxidant: decomposition of hydrogen peroxide, mainly are phosphite esters, thio ester. Supported anti-phosphite esters and thio-lipids, 168 belongs to phosphite esters of secondary resistance, through the decomposition of plastics to further degradation of peroxides produced by oxidation resistance so as to achieve the purpose, it main to provider of thermal processing stability; the use of primary and secondary resistance against together can have synergistic effects.
Generally, according to all the manufacturer's production process and materials, solvents, additives, fillers, stages of the yellow, yellow degree, it recommends using different antioxidant.

Antioxidant 1010 and antioxidant 1076 are both hindered phenolic antioxidants, but the effectively functional group of 1010 is four times of 1076. Its usage mainly consider the later compatibility with resin and processing conditions. If you have interest in antioxidants, please click here now!
Source: https://www.okchem.com/news/antioxidants-plastic-raw-materials.html