English
Español
tiếng việt
русский
High water solubility with rapid dissolution in cold and warm water.
Excellent film-forming capability yielding strong, flexible, and transparent films.
Superior adhesion to polar substrates including paper, cellulose, metals, and ceramics.
Good compatibility with starch, acrylics, and other water-soluble polymers for blended formulations.
Low residual acetaldehyde content, supporting stringent regulatory requirements for food-contact and pharmaceutical applications.
Water-soluble packaging films for agrochemicals, detergents, and industrial cleaners.
Binder in ceramic green body formation and refractory tile manufacturing.
Thickener and stabilizer in aqueous pigment dispersions for textile printing pastes.
Protective colloid in emulsion polymerization of vinyl acetate and acrylic monomers.
Adhesive component in laminating adhesives for paper-to-paper and paper-to-foil composites.
| Chemical Type | Polyvinyl alcohol (fully hydrolyzed) |
| Product Form | White granular powder |
| Appearance | Free-flowing white granules, odorless |
| Saponification Degree | 98.0–99.0 mol% |
| Viscosity (4% aqueous solution at 20°C) | 20.0–22.5 mPa·s |
| Volatiles (105°C, 2 hrs) | ≤5.0 wt% |
| pH (4% aqueous solution) | 5.0–6.5 |
| Residual Acetate Content | ≤1.0 mol% |
Q1: What is the primary functional role of POVAL PVA 217 PK in water-based formulations?
A: POVAL PVA 217 PK serves primarily as a film-forming binder and rheology modifier in aqueous systems. Its partial hydrolysis degree and molecular weight provide balanced solubility, cohesive strength, and adhesion to polar substrates—making it especially suitable for coatings, adhesives, and textile sizing applications where controlled viscosity and good substrate wetting are required.
Q2: How does POVAL PVA 217 PK differ from fully hydrolyzed PVA grades?
A: Unlike fully hydrolyzed PVAs, POVAL PVA 217 PK has a moderate degree of hydrolysis (typically ~87–89 mol%), resulting in improved cold-water dispersibility and reduced solution viscosity at equivalent concentrations. This enhances ease of handling during preparation and supports better compatibility with other water-soluble polymers or surfactants in complex formulations.
Q3: Is POVAL PVA 217 PK suitable for use in food-contact or pharmaceutical applications?
A: POVAL PVA 217 PK is manufactured under strict quality control and complies with relevant food-grade polymer specifications. While it is commonly used in food packaging adhesives and pharmaceutical tablet coatings, final regulatory compliance depends on the complete formulation, processing conditions, and end-use application—users should conduct appropriate safety and migration assessments per their target market requirements.
Q4: What are typical storage and handling recommendations for this grade?
A: Store in a cool, dry place away from direct sunlight and sources of moisture. Keep containers tightly sealed to prevent hygroscopic absorption, which may affect dissolution behavior. When dissolving, gradual addition with continuous agitation is recommended to avoid surface gelation; full dissolution typically requires gentle heating to 80–90°C depending on concentration and mixing efficiency.
Contact With Us:
E-mail: wangxingqiang@ericwchem.com
Have a Questions? Call Us:
Add:
Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
