Lithopone

Lithopone, also known as zinc barium white, is a white powder, insoluble in water, and acid decomposition released hydrogen sulfide, hydrogen sulfide and alkali do not work. It has good heat resistance, can improve weather resistance, anti-algae, reduce costs and has a good shade of whiteness. Lithopone is a white pigment, a mixture of zinc sulfide and barium sulfate. The precipitate reacts with zinc sulfate and barium sulfide solution, is filtered, dried and minced, then roasted to red hot and poured into the water to make a sharp cold. Masking power inferior to titanium dioxide, not acid resistant. Some lithopones are now treated with surfactants.

performance

Zinc barium white pigment is more versatile than zinc sulfide. Similar in structure to zinc sulfide composition, containing barium sulfate composition, slightly less durable. Poor resistance to pulverization. The price is cheap, so it can be used as a partial substitute for titanium dioxide. Zn-barium white performance: Performance index Zn-barium white refractive index 2 density 4.2 oil absorption 10-12 pH 8-9.5 Limited hiding power good chemical stability except pH & LT; 3 acid.

The stability of

Under ultraviolet light, ZnS fade to gray. To avoid this problem, nickel and iron powder can be added in preparation of zb-barium white, and cobalt and copper can be calcined first.

use

It can be used in plastics, paints, coatings, thermoplastics, thermosetting plastics and paper.