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PVA26-88
It has good solubility, film formation, adhesive property, thermal stability, solvent resistance and reactivity.
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.
Product Indicators
| Old Standard Grades Name | New Standard Grades Name | Hydrolysis (mol%) | Viscosity(mpa.s) |
Volatile(%≤)
|
Ash(%≤)
|
PH (value) |
Purity (% ≥)
|
| 26-88 | 088-60 | 86.5-89.0 | ≥60.0 | 5.0 | 0.5 | 5-7 |
93.5
|
Application
(1) PVAc protective colloid
(2) Adhesives
(3) Rewetting agent
(4) PVC, PS suspension granulation agent
(5) Thickening agent
(6) Fluorescent screen photoreceptor
Packing:
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