Research on negative ion-functional inorganic artificial stone

In architectural decoration, inorganic artificial stone has become a widely used material. However, it suffers from limited surface performance and functional simplicity. In this study, tourmaline was modified to enhance its negative-ion release capacity. The modified negative ion powder was used as a filler to prepare a negative ion-type UV curable coating (UVCC), which was then applied to the surface of artificial stone to obtain a negative ion-functional inorganic artificial stone. The results show that when 30 % by mass of CeO 2 is added to 1200-mesh tourmaline powder, the negative ion release capacity of the composite powder increases from 197 ions/cm 3 to 586 ions/cm 3 . After heat treatment at 900 ℃ for 1 hour, the negative ion release capacity of the composite powder further rises to 828 ions/cm 3 . When 15 % of the modified negative ion powder is incorporated into the basic UVCC formula, the prepared negative ion-type UVCC coating enables the artificial stone to achieve a negative ion release capacity of over 500 ions/cm 3 , with a coating gloss higher than 90°, a hardness of 4 H, and an adhesion of grade 1. This work successfully improves both surface properties and health functionality, broadening the application potential of inorganic artificial stone.