VINNAPAS® EF 1577 (CGN)
VINNAPAS® EF 1577 (CGN) is an aqueous polymer dispersion based on vinyl acetate and ethylene. The dispersion is not produced with any added organic solvents, plasticizers or formaldehyde donors.
- VINNAPAS® EF 1577 (CGN) can be used to produce plasticizer-free textile coatings with good permanent flexibility and resistance to ageing.
- VINNAPAS® EF 1577 (CGN) offers high dry strength, excellent absorbent properties and imparts medium/ firm hand.
- It can also be used as a binder for medium soft nonwovens with limited wet strength at a very low formaldehyde content.
VINNAPAS® EF 1577 (CGN) can be applied by a number of different application methods including foaming (direct coating), pan coating, saturation and spraying.
It performs well on various fiber types including polypropylene, polyamide, cellulose and polyester.
VINNAPAS® EF 1577 (CGN) can take high filler loads with calcium carbonate or aluminium trihydrate (ATH) for compounding. Surfactants can also be added to VINNAPAS® EF 1577 (CGN) to improve penetration of the binder into the substrate and improve absorbency of the finished product. Effective surfactant levels are 0.5 to 1.0% on dispersion solids. Their compatibility and efficacy should be evaluated.
VINNAPAS® EF 1577 (CGN) can be mixed with most VINNAPAS® and VINNOL® dispersions as well as with most anionic and/or nonionic aqueous polymer dispersions. Here too, the compatibility of the mixture should be tested by conducting a storage test.
We recommend alkali-swellable poly(acrylic acid) derivatives or products with neutral pH, e.g., those based on cellulose derivatives, poly(vinyl alcohol) or polyurethane. Their compatibility and efficacy should be evaluated.
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Wacker Chemie AG
When the dispersion is stored in tanks, proper storage conditions must be maintained. VINNAPAS® EF 1577 (CGN) has a shelf life of 6 months starting from the date of receipt if stored in the original, unopened containers at temperatures between 5 and 30 °C. Any longer periods for the maximum storage period that may be described in the Certificate of Analysis which accompanies each shipment of VINNAPAS® EF 1577 (CGN), take preference over this suggestion in which case the time period stated in the Certificate of Analysis shall be solely authoritative. Iron or galvanized- iron equipment and containers are not recommended because the dispersion is slightly acidic. Corrosion may result in discoloration of the dispersion or its blends when further processed. Therefore the use of containers and equipment made of ceramics, rubberized or enameled materials, appropriately finished stainless steel, or plastic (e.g. rigid PVC, polyethylene or polyester resin) is recommended.
As polymer dispersions may tend to superficial film formation, skins or lumps may form during storage or transportation. Filtration is therefore recommended prior to utilization of the product.
Preservation for Transport, Storage and further Processing
VINNAPAS® EF 1577 (CGN) is adequately preserved during transportation and storage if kept in the original, unopened containers. However, if it is transferred to storage tanks, the dispersion should be protected against microbial attack by adding a suitable preservative package. Measures should also be taken to ensure cleanliness of the tanks and pipes. In unstirred tanks, a layer of preservative-containing water should be sprayed onto the surface of the dispersion to prevent the formation of unwanted skin and possible attack by microorganisms. The thickness of this water layer should be < 5 mm for low viscosity dispersions and up to 10–20 mm for high viscosity products. Proper procedures – periodic tank cleaning and sanitization – must be set up in order to prevent microbial attack. Contact your biocide representative/supplier for further plant hygiene recommendations. Measures should be taken to ensure that only clean air enters the tank when the dispersion is removed.