Difference between revisions of "Elvanol"
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Revision as of 13:49, 1 December 2020
Description
[Kuraray-Poval (formerly DuPont)] A registered trademark for a series of Polyvinyl alcohol emulsions. Elvanol® products are prepared in water solutions and are compatible with Starch and Carboxymethyl cellulose. When dried, they produce a water-resistant coating. They are used commercially as adhesives, emulsifiers, textile finishing materials, photosensitive coatings, and binders in paper products.
Kuraray manufactures several types of Elvanol products available as fully hydrolyzed or as a copolymer. Fully hydrolyzed grades contain few (if any) residual acetate groups, dissolve in hot (200 F) water, and remain in solution when cooled to room temp. Partially hydrolyzed grades retain some of the residual acetate groups and dissolve in water at room temperature. The copolymer grades are developed specifically for warp sizing in textile and paper industry.
Elvanol 71-30 is a medium, fully hydrolyzed grade of PVOH that has been used as a replacement for starch and as a water and grease resistant sizing, coating, or adhesive.
Synonyms and Related Terms
Elvanol 71-30
Personal Risks
May contain trace amounts of methanol and sodium acetate.
Kuraray Poval claims there are no health hazards [1]
Elvanol 71-30 SDS, 2014
Collection Risks
Elvanol 71-30: Decomposition can occur below the recommended processing temperature limit. At tempoeratures above the “conditions to avoid” temperature, thermal decomposition of the resin becomes rapid. Hazardous decomposition products: carbon monoxide, Organic acids, Aldehydes, Alcohols, Sodium oxides. [2]
Environmental Risks
Biodegradable and recyclable [3]
Physical and Chemical Properties
From Elvanol 71-30 SDS, 2014:
| Form | Powder |
|---|---|
| Color | Clear |
| Odor | Mild |
| Melting Point | 200°C (392°F) |
| Specific Gravity | >1 |
| Water Solubility | Partly soluble |
Characteristics [4]:
- Excellent solubility in water
- Strong film-forming properties
- Oil and grease resistance
- Wetting properties on polar substances
- Good pigmentation
- Biodegradable
Working Properties
Elvanol® can be dissolved in the continuous cooking process designed for starch, where other standard polyvinyl alcohols remain undissolved. Beneficial in paper coating applications, especially where polyvinyl alcohols are used together with starch to enhance performance. [5]
Elvanol® is insoluble in cold-water, which allows the production of water resistant adhesives. [6]
Forms and Sizes
Sold as a powder that is dissolvable in water. [7]
Resources and Citations
- Kuraray-Poval: Elvanol Website
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 304
- Dupont at http://www.dupont.com/industrial-polymers/elvanol/index.html