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1.Introduction to the polyvinyl alcohol PVA
Polyvinyl alcohol (abbreviated as PVA) also can be called PVOH. It is a kind of heavy polymer, produced by polymerization and alcoholysis of vinyl acetate. PVA is white or light yellow floccus, granular or powdery in appearance. Its molecular formula is［CH2CHOH］n，and the molecular formula for some of the PVA is -［CH2CHOH］n-［CH2CHOOCCH3］m-. PVA is non-toxic, insipid and harmless. It is water-soluble and the solvent provide good viscosity and film building. It can withstand oils, lubricants, hydrocarbons and most other organic solvents. PVA has better chemical stability and insulatibility, and provide ease in firm building; It possess the typical chemical properties of polyols and can carry out process of esterification, etherealization, aceatalization etc. Polyvinyl alcohol is widely applied in textile, building, papermaking, packing, timber processing, agriculture, printing, polymer chemical, ceramic, iron and steel, electronic, electrolytic, electroplating and other industries. As excellent synthetic fiber property, PVA can also be spun and acetalized to make vinylon PVA fiber.
PVA has good thermal stability
No changes will take place below 140 ℃ till 160℃ itslowy turns yellow, intermolecular dehydration will take place between 170℃ to 200℃, intramolecular dehy-dration will take place above 200℃ , and will be discomposed completely above 300℃.
PVA is water soluble
PVA aqueous solution is very adhesive, especially for porous materials such as fiber, wood, paper and so on. Fully alcoholysis pva aqueous solution is easy to get at low temperature
PVA has the bio-degradation property
The degradation rate of pva with about 1700 polymerization degree is the highest.
PVA |
Viscosity (mp.s) |
Alcoholysis Degree
%(mol/ mol) |
Volatile
(%) |
Sodium Acetate (%) |
Ash (%) |
PH Value |
PVA-2688 |
65.0-75.0 |
86.0-90.0 |
≤7.0 |
≤2.5 |
≤0.5 |
5-7 |
PVA-2699 |
60-75 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-2499 |
48-60 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-2488 |
40-55 |
86.0-90.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-2099 |
32-40 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-2088 |
28-40 |
86.0-90.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1799 |
22-30 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1798 |
21-31 |
97.0-99.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1792 |
20-30 |
90.0-94.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1788 |
20-26 |
86.0-90.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1599 |
18-22 |
99-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1492 |
14-18 |
90.0-94.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1399 |
13-18 |
98.0-99.5 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1498 |
12-17 |
98.0-99.8 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-1388 |
12-14 |
87.0-89.0 |
≤5 |
≤2.5 |
≤0.5 |
5-7 |
PVA-1092 |
8-12 |
90.0-94.0 |
≤6 |
≤2.5 |
≤0.5 |
5-7 |
PVA-0599 |
5-6 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-0588 |
5-6 |
86.0-90.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-0499 |
4-5 |
98.0-100 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-0498 |
4-5 |
98.0-99.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
PVA-0488 |
4-5 |
86.0-90.0 |
≤5 |
≤2.5 |
≤0.7 |
5-7 |
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PRODUCT
