PVC heat stabilizers commonly used test methods

To introduce PVC heat stabilizers of two common test methods. Something called : Torque Rheometer test method ; second test called the roll blackened test method.
PVC heat stabilizers torque rheometer test method
Torque rheometer is an imitation of  PVC foaming board stabilizer the actual PVC processing a typical small scale type instrument . The outside of the instrument has a closed processing tank , through a computer connected to the instrument can be controlled by the temperature of the processing tank , and the rotation of the two rollers inside the added mass of material is generally a torque rheometer 60 ~ 80 g, depending on the instrument models and different. Experimental steps : preparing in advance the type comprising a heat stabilizer masterbatch based masterbatch formulations except PVC Usually there ACR, CPE, CaCO3, TiO2, lubricants and the like . Torque rheometer temperature set in advance , and when the temperature rose to specify the speed smoothly , it will weigh a good mix added processing tank , quickly closed the recording of various parameters on the computer connected to it , is the flow curve . After processing is complete, you can also get different physical characteristics of the extrudate , such as whiteness, whether shaping , smoothness and so on. With these parameters, you can determine the PVC heat stabilizer for fittings  appropriate industrial potential heat stabilizers , heat stabilizers suitable should have proper torque and plasticizing time , extrusion molding should be better and whiteness, smooth surface and so on. Torque rheometer between laboratory research and industrial mass production to build a convenient bridge .
PVC heat stabilizers roll blackened test
As a method for dynamic determination based adjuvant effect of a thermal stabilizer , in the absence of double roller dynamic rheometer using a twin roll selected experiments tableting equipment, which together with the high-speed mixed powder , tablet molding, the  carbon black resulting samples were subjected to extruded repeatedly until the black test piece until the recording time of the fully black , called blackening time . By comparing the length of time to determine the blackening of different thermal stabilizers for PVC thermal stability effect.