（1） Alkyl tin can react with unstable chlorine atom, and it can limit the initiation of dehydrochlorination reaction, to prevent the formation of large conjugated structure, the mercaptan organotin can also displace the unstable chloride ion in PVC.
（2） Sulfur organic tin have antioxidant effect, it can decompose the hydrogen peroxide, to prevent the emergence of new radical hydrogen peroxide decomposition, decrease in the concentration of free radical in the system and the stabilizing effect.
（3） Whether the hydroxy acid organic tin or mercaptan organotin are able to react the hydrogen chloride of the degradation PVC.
（4） Organic tin have the ability to capture free radicals, when it with macromolecule free radical reaction, so that the free radical termination, and it had become the stable free radical.
（5） Maleic acid tin prone to "diene addition reaction" and conjugated double bond in the molecule of PVC, the double bond conjugated double bonds is fixed and the inhibition of the conjugated chain growth, in addition, mercaptan generating the mercaptan organotin and hydrogen chloride reaction, can also carry out addition reaction with conjugated double bond.
Sulfur organic tin stabilizer is mainly the mercaptan organotin compounds and organotin tin sulfide; it is currently the most effective and general stabilizer, but its smell, toxic, not environmental protection.
Alkyl tin mercaptide and two alkyl tin often used together, in order to improve the initial coloring and long-term stability of PVC. It can be used for all polymer stability, with complete transparency like crystal; all of the PVC organic tin stabilizer can achieve the target through the appropriate formula.
