polyvinyl alcohol PVA 26-99

Characteristic

(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.

Application

(1) Adhesive industry: paper, paper tube bonding.

(2) Construction industry: acetalated products are used for building glue, interior and exterior wall coatings, adhesives.

(3) Ceramic industry: aluminum ball binder, ceramic binder, etc.

(4) Stabilizer industry: stabilizer for vinyl acetate emulsion polymerization and urea-formaldehyde adhesive viscosification .