Bentonite is mainly used as a rheological additive in coatings, and its addition amount is generally between 0.2% and 2%. It has little effect on other properties of coatings, mainly to prevent the sedimentation of pigments and fillers in coatings, and to adjust coatings. Sag and leveling balance. According to different types of bentonite, its application range is slightly different. Calcium-based bentonite and sodium-based bentonite are mainly used in water-based paints, while organic bentonite is mainly used in solvent-based paints.