What should I do if the viscosity of PVC fluctuates greatly?
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This post was last written by wang* Edited by neng on 2010-8-5 22:59 Hello everyone! The viscosity number of the SG-5 PVC we produce fluctuates greatly, sometimes it is 109.9, and sometimes it is 113.3. Mainly focused on the role of 112.4. The temperature control is also very stable now, I don't know why. Have you ever encountered this in production? How to deal with it?
Check the acetylene content in the monomer.
If the temperature control is relatively accurate, it is recommended to check whether it is an analytical error. (Especially, is the temperature of the Ubbelohde viscometer accurate? )
First, the polymerization reactor reflects temperature and pressure. The second is the quality of the monomer.
First check whether the quality of the monomer is stable and the content of high and low boiling substances inside. On the premise of stable quality, the polymerization temperature is controlled within 0.2 degrees of the formula value.