Floor covering compositions based on polyvinyl chloride

Floor covering compositions based on polyvinyl chloride

What materials and techniques are suitable for producing polyvinyl chloride-based floor coverings ?



These floorcoverings are usually quite thick and can be easily achieved using PVC plastisols or pastes. A PVC with medium molecular weight, combined with a suitable plasticisers will give outtanding results. Recommended plastisers for this type of application are phthalates such as dibutylphthalate and didecylphthalate.

To convert PVC pastes into a film requires high temperatures and since PVC tends to decompose at such temperatures is essential to incorporate a suitable heat stabiliser in the formulation. Untul recently such stabilisers tended to be based on environmentally harmful metal salts of organic and inorganic acids, but nowadays there is a growing trend to use non metalic, organic alternatives, often nitrogen based.

The PVC paste should be pigmented and filler incorporated. Fillers and pigments should, however, be resistant to acids and non-migrating, as well as being insoluble in plasticiser.PVC pastes are normally made in three stages : mixing in a slowspeed stirrer, dispersionon a triple-roll mill or ball mill, and finally deacration in a mixer under vacuum.




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