Polyvinyl Alcohol CAS 9002-89-5 Information
| CAS |
9002-89-5 |
| Molecular formula |
C2H4O |
| Molecular weight |
44.05256 |
| EIENCS |
209-183-3 |
| Form |
Powder |
| Melting point |
>300 °C |
| boling point |
-14.5°C (rough estimate) |
| Density |
1.080 g/cm3 |
| Solubility |
H2O: soluble (hot) |
| PKA |
/ |
| Color |
White to cream |
| Storage temp |
Store below +30°C. |
What is Polyvinyl Alcohol CAS 9002-89-5?
The main structure in its molecule is 1, 3-propanediol, that is, the "head · tail" structure. Degree of polymerization is classified into ultra-high degree of polymerization (molecular weight 250,000-300,000), high degree of polymerization (molecular weight 170,000-220,000), medium degree of polymerization (molecular weight 120,000-150,000), and low degree of polymerization (25,000-35,000). The degree of alcoholysis is generally available in three types: 78%, 88%, and 98%. The degree of partial alcoholysis is usually 87% - 89%, while that of complete alcoholysis is 98% - 100%. Usually, the thousands and hundreds digits of the average degree of polymerization are placed at the front, and the percentage of the degree of alcoholysis is placed at the back. For example, 17-88 indicates that the degree of polymerization is 1700 and the degree of alcoholysis is 88%. Generally speaking, as the degree of polymerization increases, the viscosity of the aqueous solution also increases, and the strength and solvent resistance of the formed film improve, but the solubility in water and the elongation after film formation decrease
. It also possesses the chemical reactivity of long-chain polyols such as esterification, etherification and acetalization. It gradually changes color when heated above 100℃, changes color rapidly when heated above 150℃, decomposes when heated above 200℃, and turns into a polymer containing conjugated double bonds when heated above 250℃. The property of color change during heating can be suppressed by adding 0.5% - 3% boric acid. It has good light resistance and is not affected by light.
Polyvinyl Alcohol CAS 9002-89-5 Use
Polyvinyl alcohol is an important chemical raw material and has extensive applications:
1. Chemical industry: It is used for manufacturing polyvinyl alcohol acetal, gasoline-resistant pipes and vinylon synthetic fibers, etc.
2. Textile industry: As fabric treatment agents, warp yarn sizing agents, etc., coating warp yarns with polyvinyl alcohol or treating them with a mixed sizing agent made of polyvinyl alcohol and modified starch can enhance the wear resistance, breathability and strength of textiles. In the field of military textiles, it can produce clothing with good breathability, heat insulation and flame retardancy.
3. Architectural decoration industry: Used in 107 glue, interior and exterior wall coatings, adhesives, etc.
4. Papermaking industry: Used as a coating for paper and an adhesive for paper products.
5. In agriculture: It can be used as a soil conditioner, pesticide adhesion enhancer and polyvinyl alcohol film, etc.
6. Daily cosmetics industry: It has certain applications.
7. Food packaging industry: Polyvinyl alcohol film is a material with excellent barrier properties. Using it as the barrier layer material for food packaging can significantly extend the storage period of the packaged food.
8. In the medical field: For instance, polyvinyl alcohol eye drops can be used as a lubricant to alleviate dry eye symptoms.
9. Other aspects: It can also be used as a high-frequency quenching agent, etc.
Polyvinyl Alcohol CAS 9002-89-5 safety
On October 27, 2017, the International Agency for Research on Cancer of the World Health Organization released a preliminary list of carcinogens for reference. Polyvinyl alcohol is on the list of Group 3 carcinogens, meaning it is still uncertain whether it is carcinogenic to humans. Its danger description is that it is harmful to the body after absorption, flammable and irritating.
