The PTA may be by means of actions of its surficial positive charges and intermolecular forces among macromolecules to absorb on the surface of clay grains to prevent clay from hydrating swelling.

• PTA粘土稳定剂是通过其表面的正电荷和大分子之间的分子间力强烈地吸附在粘土颗粒表面，防止粘土水化膨胀而起作用的。