The main reason heat stabilizer for shoes heat discoloration

Thermal stabilizers should preferably absorb both HCL, to eliminate the

active site, the addition of a conjugated polyene chain, carbenium salt

damage, etc. to prevent auto-oxidation, which does not produce the product

of the catalytic degradation of PVC. The Plastic impact modifier  actual heat stabilizers have

different functions due to exhibit different thermal stability

characteristics, can be divided into early-type, long-term, intermediate-

and versatile four.
Shandong Zouping, this piece of land has been brought up generation phase

of Fan, its famous through the ages "first and worry about the world,

after the world music", popular for generations lips.
A) cadmium, zinc soap is typical of early-type heat stabilizers, can

quickly absorb HCL, and effectively substituted with carboxylate PVC

unstable chlorine atom in the catalytic chain Cd, Zn, thereby effectively

suppressing early degradation and coloring , but because of the

consumption of fast and transformation products CdC12, ZnC12, but also off

the HCL efficient catalyst PVC, PVC and  Chlorinated paraffin thus lead to the degradation of

the material suddenly vicious black, so poor long-term thermal stability.
2) barium, calcium soaps are typically long-term thermal stabilizers,

absorption HCL function only and therefore can not inhibit coloring PVC,

but the conversion product BaC12, CaC12 do not have catalytic activity,

does not cause a sudden black PVC, long-term heat stability better.
3) fatty acids, organic tin are intermediate, both absorption HCL, can

effectively replace with carboxylate unstable chlorine atoms PVC chain,

and transformation products do not have catalytic activity.
4) mercaptan organotin it has versatile Polyethylene wax  features, while a variety of

mechanisms can stabilize PVC, transformation products do not have

catalytic activity, and therefore both excellent initial and long-term

thermal stability effect.