VINNAPAS® EP 6300
VINNAPAS® EP 6300 is a carboxylated, high solids vinyl acetate-ethylene (VAE) copolymer dispersion with a glass transition temperature (Tg) of 0 °C. It offers excellent adhesion to films and metals along with excellent cohesive film strength and is crosslinkable.
特性
VINNAPAS® EP 6300 can accept common plasticizers that are typically used with VINNAPAS® 400. It will not thicken appreciably upon plasticizer addition, which helps the formulator maintain moderate viscosity at high solids where needed. To increase the viscosity, various alkalies or typical water-soluble polymers can be used. The alkali method is effective only to a pH of 6.5. If nonvolatile alkalies are used, adhesion may decrease because of their reaction with carboxyl groups. The dispersion will accept high loadings of clay, calcium carbonate, and other fillers. This dispersion can be compounded with fully hydrolyzed poly(vinyl alcohol) solutions to provide highly water-resistant films. The heat resistance can be enhanced with additional poly(vinyl alcohol). Water and heat resistance can also be improved with crosslinking through the carboxyl functionality.
VINNAPAS® EP 6300 is an excellent base for adhesive formulators and can be used in a wide variety of applications. The ethylene in the polymer acts as an internal plasticizer which provides flexibility and reduces or eliminates the need for plasticizer in many applications. The carboxylation provides increased adhesion to metal surfaces such as aluminum, mild and galvanized steel, brass, lead, and tin plate. It also provides improved adhesion to metallized films and other films such as Mylar, cellulose acetate, PVC, and cloth. The films can be coated, dried, and heat sealed to a variety of surfaces. VINNAPAS® EP 6300 can be used in heat seal applications for metals foils and for plastic adherends.
储存
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.
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