Clay (smectite) takes a sheet structure whose crystal form spreads in two dimensions. By virtue of this characteristic, high added value can be achieved by dispersing at the nano level in the organic polymer material. For example, it has been applied in various fields since it shows improved mechanical properties and gas barrier properties of resins, or imparts flame retardancy and heat resistance.
The amount of clay added as resin filler is about several%. In general, it can be carried out by polymerization method of polymerizing monomers in the presence of dispersed clay, or melt kneading method of dispersing clay directly into polymer. In doing so, it depends on compatibility between clay and resin and machine specifications, so optimization is required. In addition, it is relatively easy to disperse clay in the polymer by mixing with a dispersion medium having affinity for both polymer and clay.
On the other hand, by further increasing the clay content, the characteristics unique to clay are further emphasized, and functions such as barrier properties, heat resistance, and dimensional stability can be demonstrated.