PVC thermal stabilizer
PVC thermal stabilizer, also called PVC heat stabilizer is the most important and indispensable material in the fomular.
The stabilizers on the market are basically no longer the same as before: three salt, two salt, lead stearate, barium stearate. What's more, some transparent and soft products are using organic tin, liquid calcium cadmium, composite stabilizer accounted for most of the market, mainly calcium and zinc composite stabilizer, lead salt composite stabilizer, hydrotalcite composite stabilizer, rare earth compound stability Agents, etc.
Since the composite stabilizer is even more indispensable, how to evaluate the stability of the stabilizer?
For thermal stability requirement, the stability of PVC stabilizer can be divided into initial stability, long-term stability and residual stability. The initial stability refers to the color to maintain stability, refers to the stability of the color of the product from the mixing to the output in any one production cycle, or color to maintain within the allowable range. Long-term stability refers to the color change caused by accidental breakdown of the material decomposition, but does not shut down the stability of cleaning. Residual stability refers to pvc finished products in the late use of the stability.
For the test method, the stability can be divided into static thermal stability and dynamic thermal stability. Static thermal stability refers to the ability of thermal stabilizers to retard the thermal decomposition of PVC in the presence of only heat or heat and air. Dynamic thermal stability is the ability of thermal stabilizers to retard the thermal decomposition of PVC under the combined action of heat, air and shear forces.