WeKcelo MP K-I and WeKcelo MP K-II are desined for PVC purpose . Purpose :
The monomer should be dispersed to stable granule in the polymerization process of PVC suspending polymerization system. By using HPMC as
dispersant, it can effectively improve the suspending dispersing performance, the shape of granule, and the absorbency to plasticizing agent.
Normally the HPMC is confected to water solution for using. First, add 50% of needed deionized water (about 85οC); add in WeKcelo and stir for 45
minutes (80r/min-90r/min); then add the rest of needed water; cool while stiring by cooling water for complete soluble solution because HPMC swells
by heat that delamination may happen in the solution . Please note that if stir is not sufficient, may some WeKcelo didn’t dissolve completely , then
quality of solution will be effected . Different HPMC solution requires different cooling temperature : product K-I type to 20οC; type K-II to 25οC .
Application attention :
The amount of HPMC added has direct influence to the distribution of resin granule shape. Under the situation of no surface active agent and other salt,
increasing the HPMC concentration will change the shape to fish eye, and high viscosity HPMC will cause rough granule.
HPMC product polymerization system is very sensitive to soluble iron salt. Under centain circumstances, even rion content of <20ppm can cause rough
granule; therefore, it is necessary to keep water, monomer and other materials pure from the pollution of iron.