Pertex 552 is an aqueous solution of a about 55% hydrolysed polyvinyl alcohol. It has been developed by TianJin Sunnymer Suspending Agents Co Ltd as a secondary suspending agent for PVC suspension polymerization. Pertex 552 can be used in conjunction with conventional all primary suspending agents.
In optimised recipes for SPVC, improvements can be obtained in the porosity/bulk density relationship. Better porosity facilitates both monomer removal and plasticizer uptake.
|Appearance:||Slightly Yellow aqueous solution|
|Total Solids||39.0 – 41.0||%|
|Degree of Hydrolysis||53.0 – 57.0||mole%|
|Viscosity @ 25 °C Brookfield DV2T||<2400||mPa.s|
|Methanol Content||< 2||% w/w|
Pertex 552 can be charged either directly to the reactor or pumped into a flowing water charge line. It is desirable to add Pertex 552 after at least some of the primary suspending agent has been added.
Pertex 552 can be used over the whole molecular weight range, at high K values to increase plasticizer absorption and at low K values to improve VCM release.
Increased porosity obtained by using Pertex 552 allows less severe stripping conditions to be used to achieve the required residual monomer levels. Thus it is often possible to reduce stripping time, stream consumption or stripping temperature with attendant advantages in increased output, reduced costs and improved product heat stability.
Pertex 552 should be stored in sealed containers as received. In this condition, the product should remain fit for use for 24 months from the date of production. Beyond that date, the material may still be fit for use, but we would advise that it is good practice to test the material.
Pertex 552 can be supplied in 200kg plastic drums, 1000kg cage type intermediate bulk containers.
Before handling, please read the Safety Data Sheet of this product for advice on safety, use and disposal.
For further information regarding this product please refer to:
TianJin Sunnymer Suspending Agents Co., Ltd Head Office
Phone: +86 (0)22 63313182
FAX: +86 (0)22 63313199