Polyvinyl Alcohol PVA 20-99
Product origin ningxia,china
Delivery time 10-15 days
It has good solubility, film formation, adhesion, thermal stability, solvent resistance and reactivity.
Application
Paper sizing agent
Warp sizing in textile
Adhesive
Raw material of polyvinyl alcohol panel and PVA thin film
Paint and Coatings
Medicine、cosmetic and functional materials
Emulgator and dispersing agent
Specifications
a. Hydrolysis degree: 98.0% - 100.0%
b. Purity: ≥93.5%
c. Viscosity: 45.0 - 58.0mpa.s
d. Volatile：≤5.0%
e. PH：5~7
f. Ash：≤0.7%
Storage
The material is very stable with no risk of molding and deteriorating. Under dry condition. Indefinite when protected from moisture.
Dissolving Method
Pouring a certain amount of water into the dissolving tank, the water temperature should be below 30 ℃, then start the blender and pour into PVA slowly, the filling speed with PVA should be keep into 10 kilograms per minutes advisable. Confirm the PVA powder has fully dispersed (about 10-20 minutes) then heat the solution, and it can be completely dissolved when heat to 90 ℃ about 1 hour.
Method of analysis
Viscosity is measured in 4% aqueous solution at 20℃. By a Brookfield type viscosimeter. PH is measured in 4% aqueous solution at 20℃ash expressed as Na2O.
