Brève introduction :
Polyvinyl Alcohol 05-88 (also known as PVA 0588 or 088-05) is a partially hydrolyzed, low-viscosity grade water-soluble polymer. It appears as white granules or powder.
With a viscosity range of 4.8 – 6.0 mPa.s and a degree of alcoholysis between 86.5 – 89.0 mol%, PVA 05-88 offers excellent solubility, surface activity, and film flexibility. It is specifically engineered for applications requiring high penetration and flow, such as textile sizing for fine filaments and as a stabilizer for emulsion polymerization.
Caractéristiques:
| Article | Spécification |
|---|---|
| Degree of Alcoholysis (mol%) | 86.5 - 89.0 |
| Viscosity (mPa·s) | 4.8 - 6.0 |
| Volatile Content (wt%, max) | 5 |
| Purity (wt%, min) | 93.5 |
| valeur du pH | 5 ~ 7 |
| Ash Content (wt%, max) | 0.6 |
Main Characteristics:
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Solubilité: Exhibits strong hydrophilicity. While it is soluble in water, for optimal performance, it is generally recommended to dissolve it in hot water (above 90°C). It is insoluble in most organic solvents.
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Film Forming: Forms flexible films with excellent mechanical properties. The film acts as a superior barrier against gases like Hydrogen, Nitrogen, and Oxygen.
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Adhesiveness: Provides strong bonding strength to hydrophilic surfaces, making it excellent for paper and textile applications.
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Chemical Stability: Resistant to weak acids, weak alkalis, and oils.
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Reactivity: Capable of cross-linking reactions (e.g., with boric acid) to modify water resistance and viscosity.
Applications :
Based on its low viscosity and partial hydrolysis, PVA 05-88 is widely used in:
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Industrie textile: Used as a warp sizing agent for long fibers (filaments) where deep penetration into the yarn is required.
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Adhesive & Emulsion: Acts as an effective stabilizer and emulsifier for PVAc (Polyvinyl Acetate) emulsions.
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Paper Processing: Used as a coating agent for art paper (coated paper) to improve surface gloss and printability.
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Printing & Photosensitive Materials: Essential component in zinc plate printing (photoengraving) and the manufacturing of photosensitive films.
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Specialty Adhesives: Used in the production of re-wettable adhesives (remoistening adhesives) for postage stamps and envelopes.
Emballage:
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Conditionnement: 25 kg per bag.
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Stockage: Store in a cool, dry, and well-ventilated area to prevent caking and moisture absorption.
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Product Stockage:
Keep in a dry, well-ventilated place to prevent moisture absorption.
FAQ:
Q: What is the difference between PVA 05-88 and PVA 17-88?
A: Both are partially hydrolyzed grades (around 88%), but they differ significantly in viscosity.
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PVA 05-88 is a low viscosity grade (4.8-6.0 mPa.s), offering better flow and penetration, suitable for fine textile sizing and coatings.
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PVA 17-88 is a medium viscosity grade (19.5-32.0 mPa.s), providing higher solution thickness and stronger initial tack for general adhesives.
Q: How does PVA 05-88 compare to PVA 05-99?
A: Both are low viscosity grades, but they differ in hydrolysis:
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PVA 05-88 is partially hydrolyzed, offering better solubility speed, flexibility, and surface activity.
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PVA 05-99 is fully hydrolyzed, offering superior water resistance and tensile strength after drying.
Q: Can PVA 05-88 be used for photosensitive coatings?
A: Yes, PVA 05-88 is specifically listed for use in photosensitive films and zinc plate printing due to its precise film-forming properties and reactivity.
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