PVC heat stabilizer types are very many, the impact on PVC transparency is different, on the current production situation, liquid organic tin PVC heat stabilizer transparency is better, three basic lead sulfate, two basic lead phosphite PVC heat stabilizer transparency is poor, how is this?
1, the refractive index of the stabilizer PVC heat stabilizer and the visible refractive index of PVC resin 1.52~1.55 is the same or similar, then the transparency of PVC products is better, on the contrary, the transparency is lower.
2, the linear length of the stabilizer molecule (molecular group) PVC thermal stabilizer molecule (or molecular group) linear length is less than visible light wavelength 400 ~ 735nm, less refraction light, higher transparency, on the contrary, lower transparency.
3, PVC heat stabilizer in PVC solubility (namely compatibility) the so-called compatibility, refers to the mutual affinity of two or more substances when mixed. Good compatibility is possible to achieve molecular dispersion. PVC heat stabilizer in the molten state if good compatibility with PVC resin, form two phases, less refraction light, PVC products of higher transparency. The liquid stabilizer is more compatible than the corresponding solid metal soap in PVC, and the linear length of the molecule is smaller, so the PVC transparency is higher.