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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