VINNAPAS® CEF 52
VINNAPAS® CEF 52 is a dispersion of a vinyl chloride, ethylene and vinyl ester terpolymer.
VINNAPAS® CEF 52 can be used as a binder for coating systems containing an opacifying pigment, such as polymer-modified plasters. The special composition and manufacturing technology mean that VINNAPAS® CEF 52 can be used to formulate very hydrophobic products.
特性
- Excellent water resistance
- Very good alkaline resistance
- Very good flameresistance
- Good compatibility with cement
VINNAPAS® CEF 52 has only a slight intrinsic odor. It forms a film that is characterized by very low water uptake and good saponification resistance. To achieve optimum weatherability in pasty plasters and facade coatings, only use opacifying pigments in adequate quantities.
VINNAPAS® CEF 52 is highly suited for use as sole binder. The dispersion, however, can also be used to modify inorganic binders, such as cement and lime, improving their tensile adhesive strength, flexural strength, deformability, abrasion resistance and processability.
In exterior insulation and finish systems (EIFS), VINNAPAS® CEF 52 is an ideal binder for adhesive and base coats - for example, by blending the dispersion with Portland cement - and an ideal sole binder for polymer plasters containing opacifying pigments. This means that it is possible to produce the entire EIFS with only one binder.
By virtue of the low flammability of VINNAPAS® CEF 52, correctly installed EIFS with this composition fall under Fire Class B as per EN 13501-1 (which applies to EIFS).
Processing
For each application, customers should always test the compatibility of VINNAPAS® CEF 52 before blending with other polymer dispersions. Dispersions with an acidic pH should be adjusted to alkaline before the dispersions are mixed. It is important to ensure that the pH does not fall over time, by (for example) adding calcium carbonate. If mixing produces an opaque film, this does not mean incompatibility, but is often due to the resin particles' different refractive indices.
Since VINNAPAS® CEF 52 has a minimum film-forming temperature of approx. 7°C, the addition of a film-forming agent is normally required. Suitable agents are 1)Lusolvan® FBH and 2)TexanolTM.
VINNAPAS® CEF 52 is stable in the neutral and alkaline pH range. Consequently, it is advisable to first place any acidic additives in a stirring vessel and to adjust their pH to about 8 before adding the dispersion.
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Wacker Chemie AG
Hanns-Seidel-Platz 4
D-81737 Munich
Germany
储存
When the dispersion is stored in tanks, proper storage conditions must be maintained. VINNAPAS® CEF 52 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® CEF 52, 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
VINNAPAS® CEF 52 is adequately preserved during transportation and storage if kept in the original, unopened containers. When stored in tanks, the dispersion should be modified with a preservative to prevent microbial contamination. Suitable measures should be taken to ensure that the tanks are properly clean. In storage tanks in which the product is not stirred, it is advisable to cover the surface of the dispersion with 1 - 2 cm of water, to which a preservative has been added. This will prevent skin formation and microbial contamination. In the case of storage in silos, it is important that the air drawn into the silo when the product is discharged is also kept free of germs. As a rule, all finished products manufactured from polymer dispersions also require preservation. The type and extent of preservation will depend on the raw materials used and the anticipated sources of contamination. The compatibility and effectiveness of the preservatives should be checked for a given formulation. Preservative manufacturers will be able to advise you on the type and amount of conservation agent to use.
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