Special whitening agent for artificial stone.

The mixture of stone powder and crushed stone with organic resin as binder is collectively called resin-type artificial stone. Artificial stone has the advantages of high strength, low density, corrosion resistance, and easy molding, but its gloss and whiteness are not as high as natural stone, and its weather resistance is also worse than ordinary granite and marble.
The factory standards for resin-based artificial stone are mainly whiteness and weather resistance. Since artificial stone is mostly used in scenes such as outdoor stairs and outdoor floor tiles, long-term exposure to ultraviolet rays from the sun will change its internal structure, causing the stone to fade, turn yellow, and reduce its strength.
Most manufacturers will choose to add titanium dioxide to change the whiteness of artificial stone. The whitening principle of titanium dioxide is to mask the original color of the product through its whiteness, thereby achieving the purpose of whitening. The surface gloss of stone whitened with titanium dioxide is very low, and it changes the structure of the artificial stone itself, resulting in low weather resistance. Therefore, titanium dioxide is not the choice for whitening resin-based artificial stone.
The main whitening principle of fluorescent whitening agents is to absorb ultraviolet rays in nature and convert them into blue-violet light visible to the naked eye, which complements the yellow light of the product itself to achieve a whitening effect without changing the structural properties of the product itself.

The resin-type artificial stone produced by adding fluorescent whitening agent has an ultraviolet absorption rate of more than 65%, which greatly reduces the invasion of ultraviolet rays to its material, thereby improving the weather resistance of the product itself.

Hongyi Chemical recommends OBJ, a special whitening agent for artificial stone. The light resistance level of fluorescent whitening agent OBJ can be as high as level 7, which fully meets the long-term use of artificial stone outdoors. The special fluorescent whitening agent OBJ developed and produced by our company can improve the yellowing resistance of resin-based artificial stone by more than 35%.