VINNOL® CEN 2752
VINNOL® CEN 2752 is a fine particle size, aqueous dispersion of a plasticizer-free, self-crosslinking copolymer of vinyl chloride and ethylene with reduced formaldehyde amount.
- Ideal binder for soft nonwovens and needle felts and as a coating and finishing agent for woven and knitted goods.
- Notable features include: good adhesion to cellulose and synthetic fibers, excellent wet strength of finishes and the reduced amount of formaldehyde.
- Finishes based on VINNOL® CEN 2752 can be high frequency welded and heat sealed.
- VINNOL® CEN 2752 is particularly suitable as a binder in flame retardant finishes.
Coatings of VINNOL® CEN 2752 possess good adhesion to PVC foil together with good heat resistance of the bond. VINNOL® CEN 2752 can therefore be used to bond PVC to cardboard, paper and fibrous materials. Because of the high chlorine content of the base polymer, VINNOL® CEN 2752 is particularly suitable as a binder in flame retardant finishes. However, as the chlorine content is generally not sufficient to ensure that all textiles are fully flame proofed, the dispersion should be combined with other flame retardant agents such as antimony oxides, phosphate esters or aluminum hydroxide. The type and level of flame retardant should be chosen according to the textile and the appropriate burning test.
VINNOL® CEN 2752 crosslinks at temperatures above 130°C, but 150°C is required for optimum durability. The pH value of VINNOL® CEN 2752 is usually sufficient for optimum crosslinking but in exceptional cases adding of 0.1-0.3 % diammonium phosphate or citric acid can improve the process.
VINNOL® CEN 2752 is miscible with most anionic and/ or nonionic polymer dispersions especially with VINNOL® CE 35. The latter will stiffen handfeel.
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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.