Overview
PVOH 725 PVC Grade is a 71 mol% hydrolyzed polyvinyl alcohol specifically developed as a primary suspending agent for suspension polymerization of vinyl chloride. It offers low molecular weight and low viscosity.
General properties
PVOH 725 is a polyvinyl alcohol with a hydrolysis rate of 72.5 mole %, specially developed as the main suspension agent for the polymerization of vinyl chloride suspensions.
PVOH 725 has a lower molecular weight and lower viscosity. This results in a well-formed PVC that is uniform across the entire range of K values. Its high level of conjugated carbonyl groups in the polymer chain gives it superior grain size efficiency.
Package
Packages: In 25 kg/bag.
Storage
Modified PVA for PVC can be stored for an unlimited period of time under appropriate conditions that is in its original packs in closed, dry rooms, at room temperature.
As supplied, the product should remain fit for use for 12 months from the date of delivery. Beyond that date, the material may still be fit for use, but we would advise that material stored for 12 months or more after delivery should be tested before use.
Technical Data
|
Title |
725 |
|
Main categories |
Primary dispersant |
|
Appearance |
Slightly Yellow grains solid |
|
Total Solids wt%(min) |
98.0 |
|
Degree of Hydrolysis (mole %) |
71.0-75.0 |
|
Viscosity@20°C,4% solution (mPa.s) |
4.8-7.0 |
|
Ash Content (as Na2O) wt% (max) |
0.5 max |
|
PH |
4.5-7.0 |
|
Residual acetate wt.% |
39.5-43.8 |
|
Cloud point of 4% soln. in water C |
28-32 degree |
| Volatile |
5% max |
Overview Modified polyvinyl alcohol (PVOH) is graded according to different degrees of polymerization, hydrolysis and copolymerization monomers. The modification of PVA is mainly to use the double bonds, ester groups and the chemical activity of the hydroxyl group after alcoholization of vinyl acetate to change the side chain group or structure, and introduce other monomers to become copolymers dominated by PVA.
Overview PVOH 725 PVC Grade is a 71 mol% hydrolyzed polyvinyl alcohol specifically developed as a primary suspending agent for suspension polymerization of vinyl chloride. It offers low molecular weight and low viscosity.
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