(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.
(1) Powder chemical building materials
(2) Adhesives
(3) Fiber processing industry
(4) Polymerization dispersant
(5) Cosmetics
(6) Medicine
Old Standard | New Standard | Item | |||||
Hydrolysi | Viscosity | Volatile | Ash | PH | Purity | ||
24-88 | 088-50 | 86.5-89.0 | 45.0-60.0 | ≤5.0 | ≤0.5 | 5~7 | ≥93.5 |