VINNAPAS® 192 (CTY)
VINNAPAS® 192 (CTY) is a self-crosslinking, aqueous polymer dispersion produced from the monomers vinyl acetate and ethylene for the Nonwovens market. The dispersion is produced without the use of plasticizers.
- VINNAPAS® 192 (CTY) offers a unique balance of high dry and wet strength, excellent absorbent properties, and imparts good handfeel.
- The dispersion has a low formaldehyde content of less than 100 ppm.
- Especially suited for use in feminine hygiene and related absorbent hygiene applications, as well as pre-moistened wipes.
VINNAPAS® 192 (CTY) can be applied by a number of different application methods including saturation, spraying, foaming and print bonding. VINNAPAS® 192 (CTY) performs well on various fiber types including cellulose, rayon, glass and polyester based substrates. Drying temperatures above 150°C are necessary to achieve proper crosslinking.
Formulating VINNAPAS® 192 (CTY) for a specific end use application may be necessary. Recommendations include the addition of an acid catalyst and a wetting surfactant. A catalyst should be added to the dispersion as a 10% solution under good agitation. Typical catalysts include ammonium chloride, sodium bisulfate and citric acid. A 1% catalyst level (solids on solids dispersion) is sufficient to achieve complete crosslinking of the polymer. Wetting surfactants can also be added to VINNAPAS® 192 (CTY) to improve penetration of the binder into the substrate and enhance absorbency of the finished product. Effective surfactant levels are 0.5 to 1.0% on dispersion solids. The compatibility and efficacy of the additives with VINNAPAS® 192 (CTY) should be storage tested if the formulated product is held for an extended period of time.
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Wacker Chemie AG
When the dispersion is stored in tanks, proper storage conditions must be maintained. If stored in the original, unopened containers at cool (below 30 °C), but frost-free temperatures the product has a shelf life of 9 months from the date of manufacture. Any longer periods for the maximum storage period that may be described in the Certificate of Analysis which accompanies each shipment of the product, 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
The product 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. To maintain proper storage conditions appropriate measures should also be taken to ensure cleanliness of the tanks and pipes. In a storage tank in which the product is not stirred, it is advisable to contact your biocide representative/supplier. Proper procedures must be set up in order to prevent microbial attack between necessary periodic tank cleaning and sanitization. These procedures will vary, since loading and unloading practices in each storage situation will differ slightly. Finished products manufactured from polymer dispersions usually also require preservation. The type and scope of preservation will depend on the raw materials used and the anticipated sources of contamination. The compatibility with other components and the efficacy of the preservative should always be tested in the respective formulation. Preservative manufacturers will be able to advise you about the type and dosage of preservative required.