Why Add Antioxidants When Making Tarpaulins

Why do you need to add antioxidants when making tarpaulins? Nowadays, when many people buy plastic tarpaulins, they will go to the wholesale of plastic tarpaulins, and these wholesale plastic tarpaulins will add some processing aids during the production process. , such as antioxidants. Why is this? First, the stability of polymers using pre-antioxidants: prophylactic or co-antioxidants can decompose hydroperoxides without forming free radical intermediates, therefore, they prevent the decomposition of hydroperoxides into free radicals The radicals are the resulting branching of the chain. Secondly, the stability of polymers using chain scission antioxidants: the reaction mechanism of antioxidants interfering with chain reaction reactive species, namely segment chain donor mechanism (CB-D) and segment chain acceptor mechanism (CB-A) The typical CB-D mechanism is the reaction between peroxide radicals and inhibitors such as phenols, followed by aromatic amines. The free radical generated from the inhibitor AH can destroy a peroxide group according to the reaction formula (1-43), and then there is the synergistic effect between antioxidants: a well-known example is the biscinnamoyl thiol The application of dipropionate (DLTDP) or bisstearoyl thiodipropionate (DSTDP) and sterically hindered phenols in the thermal stability of certain polymers. Another very important example of synergy is the complex effect of sterically hindered phenols and phosphites in improving the melt stability of polyolefins.

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