VINNAPAS® AN 214
VINNAPAS® AN 214 is a fine particle size, aqueous dispersion of a self crosslinking copolymer of vinyl acetate and an acrylic ester.
- VINNAPAS® AN 214 forms a hard, tough, elastic film which exhibits very good water resistance, especially when crosslinked,
- In addition, it shows a low swelling in chlorinated hydrocarbons and a good resistance to aging.
- Because it forms a particularly hard non-brittle film, VINNAPAS® AN 214 is ideally suited as a sprayable binder for waddings as well as finishing agent for woven and knitted goods.
VINNAPAS® AN 214 crosslinks at temperatures above 130 °C but 150 °C is required for optimum durability.
The pH-value of VINNAPAS® AN 214 is usually sufficient for optimum crosslinking but in exceptional cases the addition of 0.1–0.5 % diammonium phosphate can accelerate the process.
VINNAPAS® AN 214 is miscible with most anionic and/or nonionic aqueous polymer dispersion especially with the crosslinkable type VINNAPAS® EN 428 dispersion, which imparts a softer handle. It is usually also possible to combine VINNAPAS® AN 214 with curable or fibre crosslinking synthetic resin pre-condensates and/or reactive resins.
Fillers and Pigments
If, for coating applications, VINNAPAS® AN 214 is to be pigmented, only pH neutral fillers and pigments should be used since they would otherwise interfere with the crosslinking process which takes place in the acid pH range.
Suitable defoaming agents are, for example, 1)SILFOAM® SE9, SLE or SRE or 2)FOAMASTER® types MO 2134 and MO 2135 or 3)Agitan 352. Their efficacy and compatibility in the formulation chosen should always be checked.
1) SILFOAM® is a trademark of Wacker Chemie AG
2) FOAMASTER® is a trademark of BASF SE
3) AGITAN® is a trademark of MÜNZING Chemie GmbH
Thickeners which are pH neutral products e.g. cellulose derivatives, polyvinyl alcohol or polyurethane based are especially recommended. VINNAPAS® AN 214 crosslinks under acidic conditions so that if an alkali swellable acrylic acid copolymer is to be employed, the pH should be adjusted with ammonia.
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Wacker Chemie AG
When the dispersion is stored in tanks, proper storage conditions must be maintained. The product 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 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 containers and equipment are not recommended. Corrosion could result in discoloration of the dispersion or blends made from it in further processing. We therefore recommend the use of containers and equipment made of ceramic, rubberized or enameled materials, appropriately finished stainless steel, or plastic (rigid PVC, polyethylene or polyester resin). As polymer dispersions may tend to superficial film formation, skins or lumps may be formed during storage or transportation. A filtration process is thus 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.
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.
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.