Breve introducción:
Polyvinyl Alcohol 24-88 is a water-soluble, environmentally friendly polymer that exhibits properties intermediate between plastics and rubbers. Available as white or slightly yellow granules or powder, this grade is characterized by its higher molecular weight and viscosity compared to standard grades like 17-88.
PVA 24-88 is engineered for applications requiring superior adhesiveness y protective colloid properties. It offers excellent film flexibility, abrasion resistance, and strong barrier properties against gas and oil. Its unique composition ensures thermal stability and smoothness in final formulations.
Presupuesto:
| Artículo | Especificación | Nota |
|---|---|---|
| Product Name | Polyvinyl Alcohol (PVA) 24-88 | |
| Apariencia | White or slightly yellow granules/powder | |
| Degree of Alcoholysis | 86.00 - 90.00 mol% | (Partially Hydrolyzed) |
| Viscosidad | 43.0 - 65.0 mPa.s | (High Viscosity) |
| Volatile Content | ≤ 5.0 wt% | |
| Pureza | ≥ 93.5 wt% | (Calculated value) |
| Valor de pH | 5 ~ 7 | |
| Ash Content | ≤ 0.5 wt% |
Aplicaciones:
Based on its high viscosity and strong physical properties, PVA 24-88 is suitable for:
-
High-Strength Adhesives: Due to its superior adhesiveness, it is ideal for wood glue, paper bonding, and heavy-duty office pastes where higher tack is required.
-
Protective Colloids: Excellent for use as a stabilizer in emulsion polymerization (e.g., VAE emulsions) due to its specific protective colloid properties.
- Construction Binders: Used in building materials to improve mortar flexibility and adhesion.
-
Film & Coating: Capitalizing on its flexible film formation and oil/solvent resistance for industrial coatings.
Embalaje:
25 kg per bag.
Producto Almacenamiento:
Keep in a dry, well-ventilated place to prevent moisture absorption.
FAQ:
Q: What is the main difference between PVA 1788 and PVA 2488?
A: The primary difference is viscosity. PVA 2488 has a significantly higher viscosity (43.0-65.0 mPa.s) compared to PVA 1788 (19.5-32.0 mPa.s). This means PVA 2488 provides a thicker solution and stronger initial bonding strength, making it better for heavy-duty adhesives, while 1788 is better for applications requiring faster flow.
Q: Is PVA 24-88 fully water-soluble?
A: Yes. With a degree of alcoholysis between 86.00-90.00 mol%, it is a partially hydrolyzed grade that dissolves well in water. However, due to its higher viscosity, it may require slightly longer agitation or higher temperatures to dissolve completely compared to lower viscosity grades.
Q: What does “partially alcoholized” mean for my application?
A: “Partially alcoholized” (or hydrolyzed) means the polymer retains some acetate groups. This specific range (86-90%) gives PVA 24-88 excellent adhesion to hydrophobic surfaces (like plastics) and makes it more surface-active than fully hydrolyzed grades, which is why it is excellent as a protective colloid.
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