Plastisols: An Important Class of Thermoplastic Materials
Plastisols are a class of polymer dispersion consisting of polymer particles dispersed in a liquid plasticizer. When heat is applied to plastisols, the polymer particles soften and fuse together forming a uniform thermoplastic material. They offer significant advantages over other traditional coatings due to their ability to be applied through low cost processes such as brushing, spraying or dipping.
Composition
A basic formulation contains three main ingredients - a vinyl resin polymer, a plasticizer, and stabilizers. The polymer is often a vinyl chloride Plastisols or copolymer. Common plasticizers used are phthalate esters which help impart flexibility to the finished coating. Stabilizers such as organotin or barium-zinc compounds are added in small amounts to maintain colloidal stability of the dispersion at room temperature. Other additives such as pigments, fillers and flow control agents may be included to tailor the properties as per end use requirements.
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