(1) Solubility: hydrophilic, easily soluble in water (generally dissolved in hot water above 90℃), insoluble in almost all organic solvents.
(2) Film formation: easy to form film, the mechanical properties of the film is excellent. In addition to H2O, PVA film has excellent resistance to H2, N2, O2 and other gases.
(3) Adhesion: good adhesion with hydrophilic cellulose, paper, etc.
(4) Thermal stability: when the 17-99 flake is heated to more than 130℃, the appearance gradually changes. Fully hydrolysed PVA begins to melt at about 230 ° C and decompose above 200 ° C.
(5) Solvent resistance: PVA has strong resistance to weak acid and weak alkali, and has good oil resistance.
(6) Reactivity: with excellent cross-linking reactivity, can cross-link with boric acid, acetal reaction with formaldehyde, acetaldehyde, etc., the product has water resistance.
◆ Film processing industry
◆ Paper processing industry
◆ Adhesive industry
◆ Additive for building materials
◆ Stabilizer industry
◆ Plastic molding industry
Old Standard Grades Name | New Standard Grades Name | Item | |||||
|
| Hydrolysis (mol%) | Viscosity (mpa.s) | Volatile (%≤) | Ash (%≤) | PH (Value) | Purity (% ≥) |
17-88 | 088-20 | 86.5-89.0 | 20.5-29.0 | ≤5.0 | ≤0.5 | 5~7 | ≥93.5 |