Nowadays, when buying PVC tent fabrics, many people will go to wholesale PVC tent fabrics. These wholesale PVC tent fabrics will add some processing aids, such as antioxidants, during the production process. Why is this?
First, the stability of the polymer using pre-antioxidants: preventive or co-antioxidants can decompose hydroperoxides without forming free radical intermediates, thus preventing chain branching caused by the decomposition of hydroperoxides into free radicals.
Second, the stability of polymers using chain-breaking antioxidants: the reaction mechanism in which antioxidants intervene in the chain reaction, namely the chain-breaking donor mechanism (CB-D) and the chain-breaking acceptor mechanism (CB-A), is the peroxide The reaction of free radicals with inhibitors such as phenols, followed by aromatic amines. The free radicals generated by the inhibitor AH can destroy the peroxide groups, as shown in equation (1-43).
Then there is the synergistic effect between antioxidants: a very well-known example is that of dicinnamoylthiodipropionate (DLTDP) or distearoylthiodipropionate (DSTDP) and sterically hindered phenols in some aggregates. applications in thermal stability. Another important example of synergy is the complex interaction between sterically hindered phenols and phosphites when enhancing the melt stability of polyenes in PVC tarpaulin fabrics.