Brief Introduction:
Polyvinyl Alcohol 05-99 (also known as PVA 098-05 or 0599) is a fully hydrolyzed, low-viscosity grade water-soluble polymer. Unlike partially hydrolyzed grades (such as 17-88), PVA 05-99 is characterized by a high degree of hydrolysis (98.2 – 100.0 mol%).
This unique chemical structure grants it superior water resistance after drying, high tensile strength, and excellent resistance to organic solvents and oils. It is widely used in applications requiring strong film formation and durability against moisture.
Specifications:
| Item | Specification |
|---|---|
| Degree of Alcoholysis (mol%) | 98.2 - 100 |
| Viscosity (mPa·s) | 5.0 - 6.5 |
| Volatile Content (wt%, max) | 5 |
| Purity (wt%, min) | 93.5 |
| pH Value | 5 ~ 7 |
| Ash Content (wt%, max) | 0.7 |
Main Characteristics:
PVA 05-99 is distinguished by its fully hydrolyzed structure, offering specific performance advantages:
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Solubility & Water Resistance: It exhibits strong hydrophilicity but requires hot water (typically above 90°C) for complete dissolution. Once dried, the film shows significantly higher water resistance compared to partially hydrolyzed grades. It is insoluble in almost all organic solvents.
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Gas Barrier Properties: The film formed by PVA 05-99 provides an exceptional barrier against gases such as Hydrogen (H2), Nitrogen (N2), and Oxygen (O2), although it remains permeable to water vapor.
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Adhesiveness: It demonstrates excellent bonding strength with hydrophilic materials, particularly porous surfaces like cellulose, paper, and textiles.
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Thermal Stability: The product remains stable when heated up to 130°C. It begins to melt around 230°C, with decomposition occurring at temperatures above 200°C.
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Chemical Resistance: It offers robust resistance to weak acids, weak alkalis, and oils/greases, making it suitable for harsh industrial environments.
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Reactivity: It possesses excellent cross-linking reactivity. It can react with boric acid for cross-linking or undergo acetalization with formaldehyde/acetaldehyde to further improve water resistance.
Applications:
Due to its fully hydrolyzed nature, PVA 05-99 offers distinct advantages in specific industries:
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Paper Industry: Used for paper surface sizing and pigment coating. It improves the paper’s surface strength, printability, and oil resistance.
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Adhesive Industry: Acts as a critical stabilizer and polymerization aid in the production of Polyvinyl Acetate (PVAc) emulsions.
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Abrasives Manufacturing: Serves as a high-strength binder for sandpaper and grinding materials, providing durability and heat resistance.
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Textile Industry: Used in warp sizing for spun yarn, providing a protective coating that is tough yet easy to desize.
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PVA Sponges: Essential raw material for manufacturing highly absorbent PVA sponges.
Packing:
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Packaging: 25 kg per bag (Kraft paper bag with plastic liner).
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Storage: Store in a cool, dry environment. Due to its hydrophilic nature, keep packaging tightly sealed to prevent moisture absorption.
Product Storage:
Keep in a dry, well-ventilated place to prevent moisture absorption.
FAQ:
Q: How do I dissolve PVA 05-99 (Fully Hydrolyzed)? A: Unlike partially hydrolyzed grades that may dissolve in warm water, PVA 05-99 requires hot water for complete dissolution. It is recommended to heat the water to 90°C – 95°C while stirring continuously. Maintain this temperature until the solution is completely clear and free of particles.
Q: What is the difference between PVA 05-99 and PVA 17-88? A: The main difference is the degree of hydrolysis.
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PVA 05-99 is fully hydrolyzed (98-100%), offering better water resistance and higher tensile strength, but requires higher temperatures to dissolve.
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PVA 17-88 is partially hydrolyzed (86-90%), making it more soluble in water (easier to dissolve) and having better surface activity, but less water resistance after drying.
Q: Can PVA 05-99 be used for water-resistant films? A: Yes. Because it is fully hydrolyzed, films made from PVA 05-99 exhibit much higher water resistance compared to partially hydrolyzed grades once dried.
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